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| OPs poisoning | ||
|---|---|---|
| Year | No | Yes |
| 2000 | 3844 | 961 |
| 2001 | 3896 | 974 |
| 2002 | 3840 | 960 |
| 2003 | 3420 | 855 |
| 2004 | 2888 | 722 |
| 2005 | 2596 | 649 |
| 2006 | 2308 | 577 |
| 2007 | 1884 | 471 |
| 2008 | 1612 | 403 |
| 2009 | 1452 | 363 |
| 2010 | 1308 | 327 |
| 2011 | 1196 | 299 |
| Total | 30244 | 7561 |
