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 | 569,353 | -1.53% |
| 2005 | 578,173 | -3.33% |
| 2004 | 598,085 | -0.89% |
| 2003 | 603,464 | -3.03% |
| 2002 | 622,319 | 1.17% |
| 2001 | 615,130 | 0.59% |
| 2000 | 611,527 | 1.29% |
| 1999 | 603,744 | 0.97% |
| 1998 | 597,945 | -0.73% |
| 1997 | 602,327 | -1.17% |
| 1996 | 609,473 | 106.52% |
| 1994 | 295,110 |
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