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, % |
|---|---|---|
| 2003 | 52,717 | -2.12% |
| 2002 | 53,857 | -0.40% |
| 2001 | 54,074 | -0.09% |
| 2000 | 54,122 | 1.83% |
| 1999 | 53,147 | -1.33% |
| 1998 | 53,866 | -2.03% |
| 1997 | 54,980 | 1.19% |
| 1996 | 54,333 | -0.45% |
| 1995 | 54,578 |
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