Emissions of organic water pollutants are measured by biochemical oxygen demand, which refers to the amount of oxygen that bacteria in water will consume in breaking down waste. This is a standard water-treatment test for the presence of organic pollutants.
| Date | Value | Change, % |
|---|---|---|
| 2005 | 521,716 | -3.34% |
| 2004 | 539,748 | -2.61% |
| 2003 | 554,238 | -5.27% |
| 2002 | 585,042 | -3.76% |
| 2001 | 607,871 | -4.01% |
| 2000 | 633,273 | -2.21% |
| 1999 | 647,553 | -2.66% |
| 1998 | 665,247 | 3.52% |
| 1997 | 642,611 | -1.69% |
| 1996 | 653,677 | 5.48% |
| 1995 | 619,735 | -10.24% |
| 1994 | 690,408 |
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