| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1989 | 
                                    
                                    0%
                                 | |
| 1 | Perennial | 4330179 | 
                                    
                                    97.6%
                                 | 
| 2 | Non Perennial | 103212 | 
                                    
                                    2.3%
                                 |