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 | 38,314 | 6.40% |
| 2006 | 36,010 | 2.59% |
| 2005 | 35,102 | 2.83% |
| 2004 | 34,136 | -1.36% |
| 2003 | 34,605 | -0.45% |
| 2002 | 34,761 | 5.30% |
| 2001 | 33,011 | 0.93% |
| 2000 | 32,707 | 2.73% |
| 1999 | 31,837 | -3.22% |
| 1998 | 32,897 | -1.66% |
| 1997 | 33,452 | -0.29% |
| 1996 | 33,548 |
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