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| year | consumption | change |
| 1986 | 9.80 | NA |
| 1987 | 9.40 | -4.08% |
| 1988 | 9.70 | 3.19% |
| 1989 | 10.00 | 3.09% |
| 1990 | 12.00 | 20.00% |
| 1991 | 12.00 | 0.00% |
| 1992 | 12.00 | 0.00% |
| 1993 | 13.00 | 8.33% |
| 1994 | 14.00 | 7.69% |
| 1995 | 14.00 | 0.00% |
| 1996 | 15.00 | 7.14% |
| 1997 | 15.00 | 0.00% |
| 1998 | 16.00 | 6.67% |
| 1999 | 17.00 | 6.25% |
| 2000 | 17.00 | 0.00% |
| 2001 | 19.00 | 11.76% |
| 2002 | 18.00 | -5.26% |
| 2003 | 20.00 | 11.11% |
| 2004 | 21.00 | 5.00% |
| 2005 | 22.00 | 4.76% |
| 2006 | 20.00 | -9.09% |
| 2007 | 22.00 | 10.00% |
| 2008 | 37.00 | 68.18% |
| 2009 | 34.00 | -8.11% |
| 2010 | 43.00 | 26.47% |
| 2011 | 45.00 | 4.65% |
| 2012 | 56.00 | 24.44% |
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