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| year | consumption | change |
| 1986 | 44.00 | NA |
| 1987 | 44.00 | 0.00% |
| 1988 | 43.00 | -2.27% |
| 1989 | 42.00 | -2.33% |
| 1990 | 44.00 | 4.76% |
| 1991 | 51.00 | 15.91% |
| 1992 | 53.00 | 3.92% |
| 1993 | 57.00 | 7.55% |
| 1994 | 57.00 | 0.00% |
| 1995 | 60.00 | 5.26% |
| 1996 | 72.00 | 20.00% |
| 1997 | 72.00 | 0.00% |
| 1998 | 77.00 | 6.94% |
| 1999 | 78.00 | 1.30% |
| 2000 | 83.00 | 6.41% |
| 2001 | 92.00 | 10.84% |
| 2002 | 77.00 | -16.30% |
| 2003 | 77.00 | 0.00% |
| 2004 | 85.00 | 10.39% |
| 2005 | 84.00 | -1.18% |
| 2006 | 87.00 | 3.57% |
| 2007 | 78.00 | -10.34% |
| 2008 | 80.00 | 2.56% |
| 2009 | 81.00 | 1.25% |
| 2010 | 87.00 | 7.41% |
| 2011 | 71.00 | -18.39% |
| 2012 | 72.00 | 1.41% |
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