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 | 60,952 | 0.71% |
| 2005 | 60,522 | -4.57% |
| 2004 | 63,419 | -7.37% |
| 2003 | 68,467 | -6.73% |
| 2002 | 73,408 | -0.01% |
| 2001 | 73,414 | -5.90% |
| 2000 | 78,015 | -4.22% |
| 1999 | 81,450 | -1.96% |
| 1998 | 83,078 | -1.62% |
| 1996 | 84,447 | -0.12% |
| 1995 | 84,547 |
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