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| year | consumption | change |
| 1986 | 6.70 | NA |
| 1987 | 8.20 | 22.39% |
| 1988 | 8.80 | 7.32% |
| 1989 | 9.70 | 10.23% |
| 1990 | 12.00 | 23.71% |
| 1991 | 13.00 | 8.33% |
| 1992 | 15.00 | 15.38% |
| 1993 | 17.00 | 13.33% |
| 1994 | 19.00 | 11.76% |
| 1995 | 15.00 | -21.05% |
| 1996 | 24.00 | 60.00% |
| 1997 | 19.00 | -20.83% |
| 1998 | 26.00 | 36.84% |
| 1999 | 20.00 | -23.08% |
| 2000 | 31.00 | 55.00% |
| 2001 | 31.00 | 0.00% |
| 2002 | 26.00 | -16.13% |
| 2003 | 30.00 | 15.38% |
| 2004 | 37.00 | 23.33% |
| 2005 | 39.00 | 5.41% |
| 2006 | 39.00 | 0.00% |
| 2007 | 41.00 | 5.13% |
| 2008 | 58.00 | 41.46% |
| 2009 | 88.00 | 51.72% |
| 2010 | 120.00 | 36.36% |
| 2011 | 138.00 | 15.00% |
| 2012 | 160.00 | 15.94% |
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