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| year | consumption | change |
| 1986 | 5.70 | NA |
| 1987 | 8.50 | 49.12% |
| 1988 | 7.90 | -7.06% |
| 1989 | 8.90 | 12.66% |
| 1990 | 4.60 | -48.31% |
| 1991 | 4.60 | 0.00% |
| 1992 | 4.60 | 0.00% |
| 1993 | 8.30 | 80.43% |
| 1994 | 12.00 | 44.58% |
| 1995 | 19.00 | 58.33% |
| 1996 | 24.00 | 26.32% |
| 1997 | 29.00 | 20.83% |
| 1998 | 31.00 | 6.90% |
| 1999 | 34.00 | 9.68% |
| 2000 | 35.00 | 2.94% |
| 2001 | 42.00 | 20.00% |
| 2002 | 52.00 | 23.81% |
| 2003 | 63.00 | 21.15% |
| 2004 | 70.00 | 11.11% |
| 2005 | 75.00 | 7.14% |
| 2006 | 80.00 | 6.67% |
| 2007 | 82.00 | 2.50% |
| 2008 | 81.00 | -1.22% |
| 2009 | 79.00 | -2.47% |
| 2010 | 78.00 | -1.27% |
| 2011 | 76.00 | -2.56% |
| 2012 | 75.00 | -1.32% |
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