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, % |
|---|---|---|
| 2006 | 28,384 | -16.87% |
| 2005 | 34,146 | 1.27% |
| 2004 | 33,718 | -16.39% |
| 2003 | 40,328 | 3.77% |
| 2002 | 38,861 | -7.85% |
| 2001 | 42,172 | 1.41% |
| 2000 | 41,586 | 1.23% |
| 1999 | 41,080 | 7.11% |
| 1998 | 38,353 | 1.45% |
| 1997 | 37,805 | 32.68% |
| 1996 | 28,494 | 3.17% |
| 1995 | 27,620 |
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