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| year | consumption | change |
| 1986 | 10.00 | NA |
| 1987 | 15.00 | 50.00% |
| 1988 | 20.00 | 33.33% |
| 1989 | 21.00 | 5.00% |
| 1990 | 14.00 | -33.33% |
| 1991 | 15.00 | 7.14% |
| 1992 | 16.00 | 6.67% |
| 1993 | 15.00 | -6.25% |
| 1994 | 15.00 | 0.00% |
| 1995 | 14.00 | -6.67% |
| 1996 | 14.00 | 0.00% |
| 1997 | 13.00 | -7.14% |
| 1998 | 14.00 | 7.69% |
| 1999 | 13.00 | -7.14% |
| 2000 | 12.00 | -7.69% |
| 2001 | 16.00 | 33.33% |
| 2002 | 14.00 | -12.50% |
| 2003 | 19.00 | 35.71% |
| 2004 | 20.00 | 5.26% |
| 2005 | 25.00 | 25.00% |
| 2006 | 34.00 | 36.00% |
| 2007 | 33.00 | -2.94% |
| 2008 | 52.00 | 57.58% |
| 2009 | 65.00 | 25.00% |
| 2010 | 70.00 | 7.69% |
| 2011 | 43.00 | -38.57% |
| 2012 | 76.00 | 76.74% |
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