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| year | consumption | change |
| 1986 | 57.00 | NA |
| 1987 | 58.00 | 1.75% |
| 1988 | 59.00 | 1.72% |
| 1989 | 60.00 | 1.69% |
| 1990 | 59.00 | -1.67% |
| 1991 | 65.00 | 10.17% |
| 1992 | 62.00 | -4.62% |
| 1993 | 59.00 | -4.84% |
| 1994 | 57.00 | -3.39% |
| 1995 | 55.00 | -3.51% |
| 1996 | 51.00 | -7.27% |
| 1997 | 49.00 | -3.92% |
| 1998 | 51.00 | 4.08% |
| 1999 | 48.00 | -5.88% |
| 2000 | 46.00 | -4.17% |
| 2001 | 46.00 | 0.00% |
| 2002 | 50.00 | 8.70% |
| 2003 | 51.00 | 2.00% |
| 2004 | 50.00 | -1.96% |
| 2005 | 48.00 | -4.00% |
| 2006 | 46.00 | -4.17% |
| 2007 | 45.00 | -2.17% |
| 2008 | 42.00 | -6.67% |
| 2009 | 43.00 | 2.38% |
| 2010 | 42.00 | -2.33% |
| 2011 | 41.00 | -2.38% |
| 2012 | 40.00 | -2.44% |
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