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 | 96,883 | -0.76% |
| 2005 | 97,622 | -2.83% |
| 2004 | 100,468 | -1.76% |
| 2003 | 102,262 | -4.60% |
| 2002 | 107,188 | 1.79% |
| 2001 | 105,305 | -2.97% |
| 2000 | 108,530 | 1.53% |
| 1999 | 106,898 | -1.40% |
| 1998 | 108,413 | 4.42% |
| 1997 | 103,819 | 0.47% |
| 1996 | 103,335 | -0.94% |
| 1995 | 104,315 |
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