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 | 12,153 | 2.14% |
| 2006 | 11,898 | 3.50% |
| 2005 | 11,496 | -1.90% |
| 2004 | 11,719 | -2.59% |
| 2003 | 12,031 | -6.63% |
| 2002 | 12,885 | 3.84% |
| 2001 | 12,408 | -12.06% |
| 2000 | 14,109 | 18.97% |
| 1999 | 11,860 | 11.68% |
| 1998 | 10,619 | -6.31% |
| 1997 | 11,334 | -18.47% |
| 1996 | 13,902 |
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