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| year | consumption | change |
| 1986 | 66.00 | NA |
| 1987 | 72.00 | 9.09% |
| 1988 | 79.00 | 9.72% |
| 1989 | 81.00 | 2.53% |
| 1990 | 79.00 | -2.47% |
| 1991 | 76.00 | -3.80% |
| 1992 | 71.00 | -6.58% |
| 1993 | 80.00 | 12.68% |
| 1994 | 85.00 | 6.25% |
| 1995 | 85.00 | 0.00% |
| 1996 | 77.00 | -9.41% |
| 1997 | 74.00 | -3.90% |
| 1998 | 66.00 | -10.81% |
| 1999 | 70.00 | 6.06% |
| 2000 | 68.00 | -2.86% |
| 2001 | 65.00 | -4.41% |
| 2002 | 71.00 | 9.23% |
| 2003 | 69.00 | -2.82% |
| 2004 | 59.00 | -14.49% |
| 2005 | 56.00 | -5.08% |
| 2006 | 52.00 | -7.14% |
| 2007 | 44.00 | -15.38% |
| 2008 | 39.00 | -11.36% |
| 2009 | 41.00 | 5.13% |
| 2010 | 45.00 | 9.76% |
| 2011 | 31.00 | -31.11% |
| 2012 | 40.00 | 29.03% |
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