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| year | consumption | change |
| 1986 | 45.00 | NA |
| 1987 | 41.00 | -8.89% |
| 1988 | 40.00 | -2.44% |
| 1989 | 39.00 | -2.50% |
| 1990 | 42.00 | 7.69% |
| 1991 | 44.00 | 4.76% |
| 1992 | 41.00 | -6.82% |
| 1993 | 43.00 | 4.88% |
| 1994 | 48.00 | 11.63% |
| 1995 | 49.00 | 2.08% |
| 1996 | 52.00 | 6.12% |
| 1997 | 51.00 | -1.92% |
| 1998 | 57.00 | 11.76% |
| 1999 | 65.00 | 14.04% |
| 2000 | 56.00 | -13.85% |
| 2001 | 55.00 | -1.79% |
| 2002 | 80.00 | 45.45% |
| 2003 | 55.00 | -31.25% |
| 2004 | 53.00 | -3.64% |
| 2005 | 60.00 | 13.21% |
| 2006 | 64.00 | 6.67% |
| 2007 | 60.00 | -6.25% |
| 2008 | 61.00 | 1.67% |
| 2009 | 70.00 | 14.75% |
| 2010 | 61.00 | -12.86% |
| 2011 | 39.00 | -36.07% |
| 2012 | 46.00 | 17.95% |
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