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 | 110,605 | -3.89% |
| 2005 | 115,086 | -6.60% |
| 2004 | 123,219 | -3.80% |
| 2003 | 128,082 | 1.12% |
| 2002 | 126,665 | 1.52% |
| 2001 | 124,765 | 10.16% |
| 2000 | 113,259 | -1.66% |
| 1999 | 115,168 | 2.05% |
| 1998 | 112,860 | -0.18% |
| 1997 | 113,063 | -2.71% |
| 1996 | 116,210 | -3.33% |
| 1995 | 120,207 |
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