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 | 97,379 | 0.63% |
| 2006 | 96,770 | 1.43% |
| 2005 | 95,402 | 0.17% |
| 2004 | 95,239 | 0.97% |
| 2003 | 94,324 | -5.52% |
| 2002 | 99,833 | 0.12% |
| 2001 | 99,709 | -3.16% |
| 2000 | 102,966 | 2.78% |
| 1999 | 100,176 | -18.89% |
| 1998 | 123,503 |
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