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 | 86,992 | 0.98% |
| 2004 | 86,149 | -1.01% |
| 2003 | 87,029 | -1.53% |
| 2002 | 88,386 | -2.11% |
| 2001 | 90,288 | -4.37% |
| 2000 | 94,413 |
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