| Value | Category | 
                                    
                    
                        | 1 | 1ST HALF MAR | 
                                    
                    
                        | 2 | 2ND HALF MAR | 
                                    
                    
                        | 3 | 1ST HALF APR | 
                                    
                    
                        | 4 | 2ND HALF APR | 
                                    
                    
                        | 5 | 1ST HALF MAY | 
                                    
                    
                        | 6 | 2ND HALF MAY | 
                                    
                    
                        | 7 | 1ST HALF JUN | 
                                    
                    
                        | 8 | 2ND HALF JUN | 
                                    
                    
                        | Sysmiss |  | 
                            
            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.