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, % |
|---|---|---|
| 2007 | 15,446 | 0.06% |
| 2006 | 15,436 | 1.72% |
| 2005 | 15,175 | -6.61% |
| 2004 | 16,248 | -3.77% |
| 2003 | 16,885 | -2.60% |
| 2002 | 17,336 | -3.66% |
| 2001 | 17,995 | 1.97% |
| 2000 | 17,647 | -0.95% |
| 1999 | 17,817 | 2.12% |
| 1998 | 17,447 | 3.86% |
| 1997 | 16,799 |
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