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 | 92,770 | 4.37% |
| 2005 | 88,887 | 32.95% |
| 2004 | 66,858 | -35.50% |
| 2003 | 103,653 | -12.83% |
| 2002 | 118,906 | 2.17% |
| 2001 | 116,378 |
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