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 | 102,086 | 0.87% |
| 2006 | 101,206 | 0.57% |
| 2005 | 100,634 | -0.20% |
| 2004 | 100,831 | -0.72% |
| 2003 | 101,563 | 4.85% |
| 2002 | 96,862 | 1.97% |
| 2001 | 94,995 | -0.79% |
| 2000 | 95,749 | -10.74% |
| 1999 | 107,267 | -9.83% |
| 1998 | 118,964 | -1.51% |
| 1997 | 120,786 | -2.80% |
| 1996 | 124,260 |
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