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 | 44,748 | 7.88% |
| 2004 | 41,480 | 3.50% |
| 2003 | 40,075 | -2.38% |
| 2002 | 41,053 | 14.87% |
| 2001 | 35,739 | 9.77% |
| 2000 | 32,559 | 1.21% |
| 1999 | 32,169 | -8.68% |
| 1998 | 35,227 | 10.57% |
| 1997 | 31,860 | 10.29% |
| 1996 | 28,886 | 0.85% |
| 1995 | 28,642 |
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