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| year | consumption | change |
| 1986 | 3.50 | NA |
| 1987 | 6.60 | 88.57% |
| 1988 | 6.90 | 4.55% |
| 1989 | 7.60 | 10.14% |
| 1990 | 7.90 | 3.95% |
| 1991 | 6.00 | -24.05% |
| 1992 | 5.60 | -6.67% |
| 1993 | 4.80 | -14.29% |
| 1994 | 4.80 | 0.00% |
| 1995 | 4.80 | 0.00% |
| 1996 | 4.90 | 2.08% |
| 1997 | 4.90 | 0.00% |
| 1998 | 5.00 | 2.04% |
| 1999 | 5.10 | 2.00% |
| 2000 | 5.30 | 3.92% |
| 2001 | 9.10 | 71.70% |
| 2002 | 11.00 | 20.88% |
| 2003 | 12.00 | 9.09% |
| 2004 | 13.00 | 8.33% |
| 2005 | 14.00 | 7.69% |
| 2006 | 14.00 | 0.00% |
| 2007 | 15.00 | 7.14% |
| 2008 | 17.00 | 13.33% |
| 2009 | 18.00 | 5.88% |
| 2010 | 15.00 | -16.67% |
| 2011 | 18.00 | 20.00% |
| 2012 | 18.00 | 0.00% |
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