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| year | consumption | change |
| 1986 | 23.00 | NA |
| 1987 | 28.00 | 21.74% |
| 1988 | 37.00 | 32.14% |
| 1989 | 50.00 | 35.14% |
| 1990 | 65.00 | 30.00% |
| 1991 | 79.00 | 21.54% |
| 1992 | 96.00 | 21.52% |
| 1993 | 116.00 | 20.83% |
| 1994 | 142.00 | 22.41% |
| 1995 | 164.00 | 15.49% |
| 1996 | 187.00 | 14.02% |
| 1997 | 197.00 | 5.35% |
| 1998 | 168.00 | -14.72% |
| 1999 | 176.00 | 4.76% |
| 2000 | 170.00 | -3.41% |
| 2001 | 172.00 | 1.18% |
| 2002 | 176.00 | 2.33% |
| 2003 | 166.00 | -5.68% |
| 2004 | 159.00 | -4.22% |
| 2005 | 163.00 | 2.52% |
| 2006 | 164.00 | 0.61% |
| 2007 | 171.00 | 4.27% |
| 2008 | 172.00 | 0.58% |
| 2009 | 180.00 | 4.65% |
| 2010 | 189.00 | 5.00% |
| 2011 | 191.00 | 1.06% |
| 2012 | 189.00 | -1.05% |
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