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, % |
|---|---|---|
| 2007 | 20,046 | 6.43% |
| 2006 | 18,836 | 4.02% |
| 2005 | 18,107 | 4.57% |
| 2004 | 17,316 | 10.73% |
| 2003 | 15,638 | -10.95% |
| 2002 | 17,561 | -6.22% |
| 2001 | 18,727 | -6.54% |
| 2000 | 20,037 | 2.78% |
| 1999 | 19,496 | -14.07% |
| 1998 | 22,687 | -21.79% |
| 1997 | 29,006 | -21.16% |
| 1996 | 36,789 |
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