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| year | consumption | change |
| 1986 | 3.60 | NA |
| 1987 | 3.80 | 5.56% |
| 1988 | 4.10 | 7.89% |
| 1989 | 4.60 | 12.20% |
| 1990 | 4.50 | -2.17% |
| 1991 | 5.30 | 17.78% |
| 1992 | 6.10 | 15.09% |
| 1993 | 7.60 | 24.59% |
| 1994 | 5.80 | -23.68% |
| 1995 | 8.40 | 44.83% |
| 1996 | 9.90 | 17.86% |
| 1997 | 9.10 | -8.08% |
| 1998 | 12.00 | 31.87% |
| 1999 | 13.00 | 8.33% |
| 2000 | 13.00 | 0.00% |
| 2001 | 14.00 | 7.69% |
| 2002 | 15.00 | 7.14% |
| 2003 | 14.00 | -6.67% |
| 2004 | 13.00 | -7.14% |
| 2005 | 13.00 | 0.00% |
| 2006 | 14.00 | 7.69% |
| 2007 | 15.00 | 7.14% |
| 2008 | 15.00 | 0.00% |
| 2009 | 16.00 | 6.67% |
| 2010 | 17.00 | 6.25% |
| 2011 | 16.00 | -5.88% |
| 2012 | 17.00 | 6.25% |
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