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| year | consumption | change |
| 1986 | 43.00 | NA |
| 1987 | 46.00 | 6.98% |
| 1988 | 49.00 | 6.52% |
| 1989 | 54.00 | 10.20% |
| 1990 | 56.00 | 3.70% |
| 1991 | 58.00 | 3.57% |
| 1992 | 60.00 | 3.45% |
| 1993 | 61.00 | 1.67% |
| 1994 | 62.00 | 1.64% |
| 1995 | 64.00 | 3.23% |
| 1996 | 68.00 | 6.25% |
| 1997 | 70.00 | 2.94% |
| 1998 | 73.00 | 4.29% |
| 1999 | 74.00 | 1.37% |
| 2000 | 76.00 | 2.70% |
| 2001 | 78.00 | 2.63% |
| 2002 | 82.00 | 5.13% |
| 2003 | 85.00 | 3.66% |
| 2004 | 87.00 | 2.35% |
| 2005 | 91.00 | 4.60% |
| 2006 | 92.00 | 1.10% |
| 2007 | 96.00 | 4.35% |
| 2008 | 94.00 | -2.08% |
| 2009 | 94.00 | 0.00% |
| 2010 | 86.00 | -8.51% |
| 2011 | 77.00 | -10.47% |
| 2012 | 68.00 | -11.69% |
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