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| year | consumption | change |
| 1980 | 37.00 | NA |
| 1981 | 44.00 | 18.92% |
| 1982 | 50.00 | 13.64% |
| 1983 | 53.00 | 6.00% |
| 1984 | 56.00 | 5.66% |
| 1985 | 58.00 | 3.57% |
| 1986 | 62.00 | 6.90% |
| 1987 | 66.00 | 6.45% |
| 1988 | 62.00 | -6.06% |
| 1989 | 62.00 | 0.00% |
| 1990 | 66.00 | 6.45% |
| 1991 | 63.00 | -4.55% |
| 1992 | 73.00 | 15.87% |
| 1993 | 72.00 | -1.37% |
| 1994 | 82.00 | 13.89% |
| 1995 | 85.00 | 3.66% |
| 1996 | 92.00 | 8.24% |
| 1997 | 88.00 | -4.35% |
| 1998 | 96.00 | 9.09% |
| 1999 | 96.00 | 0.00% |
| 2000 | 101.00 | 5.21% |
| 2001 | 99.00 | -1.98% |
| 2002 | 103.00 | 4.04% |
| 2003 | 106.00 | 2.91% |
| 2004 | 107.00 | 0.94% |
| 2005 | 112.00 | 4.67% |
| 2006 | 108.00 | -3.57% |
| 2007 | 104.00 | -3.70% |
| 2008 | 97.00 | -6.73% |
| 2009 | 98.00 | 1.03% |
| 2010 | 106.00 | 8.16% |
| 2011 | 127.00 | 19.81% |
| 2012 | 137.00 | 7.87% |
| 2013 | 134.00 | -2.19% |
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