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| year | consumption | change |
| 1986 | 6.50 | NA |
| 1987 | 6.50 | 0.00% |
| 1988 | 11.00 | 69.23% |
| 1989 | 11.00 | 0.00% |
| 1990 | 16.00 | 45.45% |
| 1991 | 14.00 | -12.50% |
| 1992 | 16.00 | 14.29% |
| 1993 | 20.00 | 25.00% |
| 1994 | 22.00 | 10.00% |
| 1995 | 24.00 | 9.09% |
| 1996 | 26.00 | 8.33% |
| 1997 | 34.00 | 30.77% |
| 1998 | 27.00 | -20.59% |
| 1999 | 32.00 | 18.52% |
| 2000 | 34.00 | 6.25% |
| 2001 | 37.00 | 8.82% |
| 2002 | 48.00 | 29.73% |
| 2003 | 50.00 | 4.17% |
| 2004 | 61.00 | 22.00% |
| 2005 | 61.00 | 0.00% |
| 2006 | 60.00 | -1.64% |
| 2007 | 73.00 | 21.67% |
| 2008 | 81.00 | 10.96% |
| 2009 | 95.00 | 17.28% |
| 2010 | 105.00 | 10.53% |
| 2011 | 112.00 | 6.67% |
| 2012 | 118.00 | 5.36% |
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