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| year | consumption | change |
| 1986 | 35.00 | NA |
| 1987 | 36.00 | 2.86% |
| 1988 | 40.00 | 11.11% |
| 1989 | 42.00 | 5.00% |
| 1990 | 43.00 | 2.38% |
| 1991 | 42.00 | -2.33% |
| 1992 | 43.00 | 2.38% |
| 1993 | 47.00 | 9.30% |
| 1994 | 46.00 | -2.13% |
| 1995 | 47.00 | 2.17% |
| 1996 | 48.00 | 2.13% |
| 1997 | 50.00 | 4.17% |
| 1998 | 49.00 | -2.00% |
| 1999 | 51.00 | 4.08% |
| 2000 | 51.00 | 0.00% |
| 2001 | 51.00 | 0.00% |
| 2002 | 55.00 | 7.84% |
| 2003 | 55.00 | 0.00% |
| 2004 | 61.00 | 10.91% |
| 2005 | 66.00 | 8.20% |
| 2006 | 68.00 | 3.03% |
| 2007 | 76.00 | 11.76% |
| 2008 | 63.00 | -17.11% |
| 2009 | 73.00 | 15.87% |
| 2010 | 67.00 | -8.22% |
| 2011 | 69.00 | 2.99% |
| 2012 | 61.00 | -11.59% |
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