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 | 160,776 | -1.46% |
| 2004 | 163,155 | -0.78% |
| 2003 | 164,433 | 3.60% |
| 2002 | 158,714 | 11.95% |
| 2001 | 141,772 | 0.84% |
| 2000 | 140,591 | 1.95% |
| 1999 | 137,900 | 1.41% |
| 1998 | 135,988 | 1.80% |
| 1997 | 133,587 | 1.43% |
| 1996 | 131,708 | 4.84% |
| 1995 | 125,629 | -4.55% |
| 1994 | 131,616 |
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