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| year | consumption | change |
| 1980 | 29.00 | NA |
| 1981 | 25.00 | -13.79% |
| 1982 | 25.00 | 0.00% |
| 1983 | 26.00 | 4.00% |
| 1984 | 23.00 | -11.54% |
| 1985 | 26.00 | 13.04% |
| 1986 | 23.00 | -11.54% |
| 1987 | 23.00 | 0.00% |
| 1988 | 25.00 | 8.70% |
| 1989 | 26.00 | 4.00% |
| 1990 | 27.00 | 3.85% |
| 1991 | 26.00 | -3.70% |
| 1992 | 31.00 | 19.23% |
| 1993 | 34.00 | 9.68% |
| 1994 | 38.00 | 11.76% |
| 1995 | 41.00 | 7.89% |
| 1996 | 44.00 | 7.32% |
| 1997 | 48.00 | 9.09% |
| 1998 | 58.00 | 20.83% |
| 1999 | 59.00 | 1.72% |
| 2000 | 59.00 | 0.00% |
| 2001 | 66.00 | 11.86% |
| 2002 | 65.00 | -1.52% |
| 2003 | 65.00 | 0.00% |
| 2004 | 68.00 | 4.62% |
| 2005 | 70.00 | 2.94% |
| 2006 | 71.00 | 1.43% |
| 2007 | 74.00 | 4.23% |
| 2008 | 67.00 | -9.46% |
| 2009 | 76.00 | 13.43% |
| 2010 | 68.00 | -10.53% |
| 2011 | 69.00 | 1.47% |
| 2012 | 70.00 | 1.45% |
| 2013 | 69.00 | -1.43% |
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