| Value | Category | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 9 |  | 
                                    
                    
                        | 15 |  | 
                                    
                    
                        | 34 |  | 
                                    
                    
                        | 35 |  | 
                                    
                    
                        | 36 |  | 
                                    
                    
                        | 44 |  | 
                                    
                    
                        | 45 |  | 
                                    
                    
                        | 46 |  | 
                                    
                    
                        | 48 |  | 
                                    
                    
                        | 49 |  | 
                                    
                    
                        | 50 |  | 
                                    
                    
                        | 55 |  | 
                                    
                    
                        | 56 |  | 
                                    
                    
                        | 60 |  | 
                                    
                    
                        | 65 |  | 
                                    
                    
                        | 67 |  | 
                                    
                    
                        | 68 |  | 
                                    
                    
                        | 70 |  | 
                                    
                    
                        | 75 |  | 
                                    
                    
                        | 77 |  | 
                                    
                    
                        | 79 |  | 
                                    
                    
                        | 80 |  | 
                                    
                    
                        | 83 |  | 
                                    
                    
                        | 85 |  | 
                                    
                    
                        | 88 |  | 
                                    
                    
                        | 90 |  | 
                                    
                    
                        | 92 |  | 
                                    
                    
                        | 95 |  | 
                                    
                    
                        | 98 |  | 
                                    
                    
                        | 99 |  | 
                                    
                    
                        | 100 |  | 
                                    
                    
                        | 103 |  | 
                                    
                    
                        | 105 |  | 
                                    
                    
                        | 110 |  | 
                                    
                    
                        | 112 |  | 
                                    
                    
                        | 113 |  | 
                                    
                    
                        | 115 |  | 
                                    
                    
                        | 120 |  | 
                                    
                    
                        | 125 |  | 
                                    
                    
                        | 130 |  | 
                                    
                    
                        | 135 |  | 
                                    
                    
                        | 140 |  | 
                                    
                    
                        | 144 |  | 
                                    
                    
                        | 145 |  | 
                                    
                    
                        | 150 |  | 
                                    
                    
                        | 158 |  | 
                                    
                    
                        | 160 |  | 
                                    
                    
                        | 167 |  | 
                                    
                    
                        | 170 |  | 
                                    
                    
                        | 180 |  | 
                                    
                    
                        | 185 |  | 
                                    
                    
                        | 190 |  | 
                                    
                    
                        | 195 |  | 
                                    
                    
                        | 200 |  | 
                                    
                    
                        | 210 |  | 
                                    
                    
                        | 215 |  | 
                                    
                    
                        | 220 |  | 
                                    
                    
                        | 240 |  | 
                                    
                    
                        | 243 |  | 
                                    
                    
                        | 245 |  | 
                                    
                    
                        | 250 |  | 
                                    
                    
                        | 255 |  | 
                                    
                    
                        | 260 |  | 
                                    
                    
                        | 270 |  | 
                                    
                    
                        | 271 |  | 
                                    
                    
                        | 280 |  | 
                                    
                    
                        | 290 |  | 
                                    
                    
                        | 300 |  | 
                                    
                    
                        | 310 |  | 
                                    
                    
                        | 320 |  | 
                                    
                    
                        | 350 |  | 
                                    
                    
                        | 360 |  | 
                                    
                    
                        | 370 |  | 
                                    
                    
                        | 385 |  | 
                                    
                    
                        | 400 |  | 
                                    
                    
                        | 410 |  | 
                                    
                    
                        | 450 |  | 
                                    
                    
                        | 460 |  | 
                                    
                    
                        | 470 |  | 
                                    
                    
                        | 500 |  | 
                                    
                    
                        | 530 |  | 
                                    
                    
                        | 540 |  | 
                                    
                    
                        | 550 |  | 
                                    
                    
                        | 560 |  | 
                                    
                    
                        | 571 |  | 
                                    
                    
                        | 600 |  | 
                                    
                    
                        | 610 |  | 
                                    
                    
                        | 650 |  | 
                                    
                    
                        | 678 |  | 
                                    
                    
                        | 700 |  | 
                                    
                    
                        | 720 |  | 
                                    
                    
                        | 730 |  | 
                                    
                    
                        | 750 |  | 
                                    
                    
                        | 800 |  | 
                                    
                    
                        | 820 |  | 
                                    
                    
                        | 900 |  | 
                                    
                    
                        | 1000 |  | 
                                    
                    
                        | 1100 |  | 
                                    
                    
                        | 1159 |  | 
                                    
                    
                        | 1265 |  | 
                                    
                    
                        | 1350 |  | 
                                    
                    
                        | 1600 |  | 
                                    
                    
                        | 1800 |  | 
                                    
                    
                        | 2100 |  | 
                                    
                    
                        | 3800 |  | 
                                    
                    
                        | 4500 |  | 
                                    
                    
                        | 12000 |  | 
                                    
                    
                        | -9 | don't know | 
                                    
                    
                        | -7 | not in business three years ago | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.