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| year | consumption | change |
| 1986 | 81.00 | NA |
| 1987 | 79.00 | -2.47% |
| 1988 | 77.00 | -2.53% |
| 1989 | 79.00 | 2.60% |
| 1990 | 80.00 | 1.27% |
| 1991 | 80.00 | 0.00% |
| 1992 | 83.00 | 3.75% |
| 1993 | 88.00 | 6.02% |
| 1994 | 90.00 | 2.27% |
| 1995 | 93.00 | 3.33% |
| 1996 | 94.00 | 1.08% |
| 1997 | 94.00 | 0.00% |
| 1998 | 95.00 | 1.06% |
| 1999 | 96.00 | 1.05% |
| 2000 | 93.00 | -3.13% |
| 2001 | 95.00 | 2.15% |
| 2002 | 97.00 | 2.11% |
| 2003 | 97.00 | 0.00% |
| 2004 | 96.00 | -1.03% |
| 2005 | 95.00 | -1.04% |
| 2006 | 97.00 | 2.11% |
| 2007 | 97.00 | 0.00% |
| 2008 | 100.00 | 3.09% |
| 2009 | 97.00 | -3.00% |
| 2010 | 97.00 | 0.00% |
| 2011 | 99.00 | 2.06% |
| 2012 | 96.00 | -3.03% |
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