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| year | consumption | change |
| 1986 | 47.00 | NA |
| 1987 | 40.00 | -14.89% |
| 1988 | 37.00 | -7.50% |
| 1989 | 43.00 | 16.22% |
| 1990 | 48.00 | 11.63% |
| 1991 | 47.00 | -2.08% |
| 1992 | 58.00 | 23.40% |
| 1993 | 63.00 | 8.62% |
| 1994 | 61.00 | -3.17% |
| 1995 | 66.00 | 8.20% |
| 1996 | 59.00 | -10.61% |
| 1997 | 56.00 | -5.08% |
| 1998 | 47.00 | -16.07% |
| 1999 | 52.00 | 10.64% |
| 2000 | 49.00 | -5.77% |
| 2001 | 54.00 | 10.20% |
| 2002 | 53.00 | -1.85% |
| 2003 | 54.00 | 1.89% |
| 2004 | 44.00 | -18.52% |
| 2005 | 51.00 | 15.91% |
| 2006 | 41.00 | -19.61% |
| 2007 | 41.00 | 0.00% |
| 2008 | 30.00 | -26.83% |
| 2009 | 24.00 | -20.00% |
| 2010 | 20.00 | -16.67% |
| 2011 | 23.00 | 15.00% |
| 2012 | 14.00 | -39.13% |
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