| Year | Number of occupational diseases | Number of cases of occupational respiratory disorders | Number of occupational asthma cases | |
| Number | % of total | |||
| 2000 | 326 | 49 | 16 | 4.9% |
| 2001 | 432 | 61 | 13 | 3% |
| 2002 | 420 | 65 | 14 | 3.3% |
| 2003 | 483 | 69 | 45 | 9.3% |
| 2004 | 597 | 79 | 42 | 13.2% |
| 2005 | 634 | 121 | 53 | 8.3% |
| 2006 | 690 | 132 | 53 | 7.7% |
| 2007 | 755 | 133 | 55 | 7.3% |
| 2008 | 701 | 108 | 70 | 10% |
| Total | 5038 | 817 | 361 | 7.17% |