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 | 46,924 | -0.70% |
| 2005 | 47,256 | -6.49% |
| 2004 | 50,535 | -1.61% |
| 2003 | 51,360 | -1.48% |
| 2002 | 52,133 | 0.14% |
| 2001 | 52,058 | -5.68% |
| 2000 | 55,191 | -2.37% |
| 1999 | 56,532 | -2.17% |
| 1998 | 57,785 | 1.73% |
| 1997 | 56,803 | 0.29% |
| 1996 | 56,637 | 2.21% |
| 1995 | 55,410 |
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