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| year | consumption | change |
| 1986 | 50.00 | NA |
| 1987 | 44.00 | -12.00% |
| 1988 | 43.00 | -2.27% |
| 1989 | 47.00 | 9.30% |
| 1990 | 42.00 | -10.64% |
| 1991 | 43.00 | 2.38% |
| 1992 | 38.00 | -11.63% |
| 1993 | 37.00 | -2.63% |
| 1994 | 44.00 | 18.92% |
| 1995 | 38.00 | -13.64% |
| 1996 | 38.00 | 0.00% |
| 1997 | 35.00 | -7.89% |
| 1998 | 34.00 | -2.86% |
| 1999 | 39.00 | 14.71% |
| 2000 | 37.00 | -5.13% |
| 2001 | 34.00 | -8.11% |
| 2002 | 36.00 | 5.88% |
| 2003 | 36.00 | 0.00% |
| 2004 | 37.00 | 2.78% |
| 2005 | 36.00 | -2.70% |
| 2006 | 36.00 | 0.00% |
| 2007 | 38.00 | 5.56% |
| 2008 | 38.00 | 0.00% |
| 2009 | 33.00 | -13.16% |
| 2010 | 29.00 | -12.12% |
| 2011 | 32.00 | 10.34% |
| 2012 | 31.00 | -3.13% |
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