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| year | consumption | change |
| 1986 | 16.00 | NA |
| 1987 | 16.00 | 0.00% |
| 1988 | 22.00 | 37.50% |
| 1989 | 29.00 | 31.82% |
| 1990 | 30.00 | 3.45% |
| 1991 | 9.90 | -67.00% |
| 1992 | 12.00 | 21.21% |
| 1993 | 17.00 | 41.67% |
| 1994 | 6.10 | -64.12% |
| 1995 | 20.00 | 227.87% |
| 1996 | 17.00 | -15.00% |
| 1997 | 37.00 | 117.65% |
| 1998 | 31.00 | -16.22% |
| 1999 | 29.00 | -6.45% |
| 2000 | 22.00 | -24.14% |
| 2001 | 41.00 | 86.36% |
| 2002 | 25.00 | -39.02% |
| 2003 | 25.00 | 0.00% |
| 2004 | 21.00 | -16.00% |
| 2005 | 29.00 | 38.10% |
| 2006 | 50.00 | 72.41% |
| 2007 | 48.00 | -4.00% |
| 2008 | 49.00 | 2.08% |
| 2009 | 19.00 | -61.22% |
| 2010 | 48.00 | 152.63% |
| 2011 | 52.00 | 8.33% |
| 2012 | 55.00 | 5.77% |
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