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 | 378,844 | -0.23% |
| 2005 | 379,728 | 1.67% |
| 2004 | 373,504 | -0.26% |
| 2003 | 374,462 | 0.33% |
| 2002 | 373,244 | -0.74% |
| 2001 | 376,042 | 1.26% |
| 2000 | 371,366 | 3.38% |
| 1999 | 359,233 | 2.53% |
| 1998 | 350,365 | 1.90% |
| 1997 | 343,821 | 1.19% |
| 1996 | 339,774 | 0.80% |
| 1995 | 337,092 |
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