| Value | Category | Cases | |
|---|---|---|---|
| 0 | NONE | 1944 | 
                                    
                                    35.5%
                                 | 
| 1 | ONE | 97 | 
                                    
                                    1.8%
                                 | 
| 2 | TWO | 200 | 
                                    
                                    3.7%
                                 | 
| 3 | THREE | 188 | 
                                    
                                    3.4%
                                 | 
| 4 | FOUR | 135 | 
                                    
                                    2.5%
                                 | 
| 5 | FIVE | 122 | 
                                    
                                    2.2%
                                 | 
| 6 | SIX | 48 | 
                                    
                                    0.9%
                                 | 
| 7 | SEVEN | 35 | 
                                    
                                    0.6%
                                 | 
| 8 | EIGHT | 31 | 
                                    
                                    0.6%
                                 | 
| 9 | NINE | 16 | 
                                    
                                    0.3%
                                 | 
| 10 | TEN OR MORE BOOKS | 290 | 
                                    
                                    5.3%
                                 | 
| 99 | NO RESPONSE | 4 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 2369 | 
                                    
                                    43.2%
                                 |