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| year | consumption | change |
| 1980 | 53.00 | NA |
| 1981 | 46.00 | -13.21% |
| 1982 | 39.00 | -15.22% |
| 1983 | 41.00 | 5.13% |
| 1984 | 35.00 | -14.63% |
| 1985 | 31.00 | -11.43% |
| 1986 | 31.00 | 0.00% |
| 1987 | 33.00 | 6.45% |
| 1988 | 38.00 | 15.15% |
| 1989 | 43.00 | 13.16% |
| 1990 | 46.00 | 6.98% |
| 1991 | 47.00 | 2.17% |
| 1992 | 51.00 | 8.51% |
| 1993 | 52.00 | 1.96% |
| 1994 | 55.00 | 5.77% |
| 1995 | 60.00 | 9.09% |
| 1996 | 62.00 | 3.33% |
| 1997 | 66.00 | 6.45% |
| 1998 | 67.00 | 1.52% |
| 1999 | 69.00 | 2.99% |
| 2000 | 66.00 | -4.35% |
| 2001 | 66.00 | 0.00% |
| 2002 | 68.00 | 3.03% |
| 2003 | 70.00 | 2.94% |
| 2004 | 71.00 | 1.43% |
| 2005 | 69.00 | -2.82% |
| 2006 | 78.00 | 13.04% |
| 2007 | 82.00 | 5.13% |
| 2008 | 80.00 | -2.44% |
| 2009 | 58.00 | -27.50% |
| 2010 | 51.00 | -12.07% |
| 2011 | 54.00 | 5.88% |
| 2012 | 52.00 | -3.70% |
| 2013 | 53.00 | 1.92% |
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