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| year | consumption | change |
| 1980 | 12.00 | NA |
| 1981 | 11.00 | -8.33% |
| 1982 | 11.00 | 0.00% |
| 1983 | 12.00 | 9.09% |
| 1984 | 12.00 | 0.00% |
| 1985 | 11.00 | -8.33% |
| 1986 | 12.00 | 9.09% |
| 1987 | 12.00 | 0.00% |
| 1988 | 13.00 | 8.33% |
| 1989 | 16.00 | 23.08% |
| 1990 | 18.00 | 12.50% |
| 1991 | 17.00 | -5.56% |
| 1992 | 18.00 | 5.88% |
| 1993 | 18.00 | 0.00% |
| 1994 | 20.00 | 11.11% |
| 1995 | 23.00 | 15.00% |
| 1996 | 25.00 | 8.70% |
| 1997 | 25.00 | 0.00% |
| 1998 | 29.00 | 16.00% |
| 1999 | 31.00 | 6.90% |
| 2000 | 28.00 | -9.68% |
| 2001 | 33.00 | 17.86% |
| 2002 | 36.00 | 9.09% |
| 2003 | 37.00 | 2.78% |
| 2004 | 42.00 | 13.51% |
| 2005 | 44.00 | 4.76% |
| 2006 | 46.00 | 4.55% |
| 2007 | 51.00 | 10.87% |
| 2008 | 49.00 | -3.92% |
| 2009 | 44.00 | -10.20% |
| 2010 | 46.00 | 4.55% |
| 2011 | 47.00 | 2.17% |
| 2012 | 51.00 | 8.51% |
| 2013 | 49.00 | -3.92% |
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