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| year | consumption | change |
| 1980 | 39.00 | NA |
| 1981 | 47.00 | 20.51% |
| 1982 | 80.00 | 70.21% |
| 1983 | 84.00 | 5.00% |
| 1984 | 105.00 | 25.00% |
| 1985 | 134.00 | 27.62% |
| 1986 | 157.00 | 17.16% |
| 1987 | 151.00 | -3.82% |
| 1988 | 165.00 | 9.27% |
| 1989 | 168.00 | 1.82% |
| 1990 | 169.00 | 0.60% |
| 1991 | 182.00 | 7.69% |
| 1992 | 195.00 | 7.14% |
| 1993 | 175.00 | -10.26% |
| 1994 | 175.00 | 0.00% |
| 1995 | 166.00 | -5.14% |
| 1996 | 186.00 | 12.05% |
| 1997 | 199.00 | 6.99% |
| 1998 | 175.00 | -12.06% |
| 1999 | 200.00 | 14.29% |
| 2000 | 212.00 | 6.00% |
| 2001 | 228.00 | 7.55% |
| 2002 | 212.00 | -7.02% |
| 2003 | 165.00 | -22.17% |
| 2004 | 147.00 | -10.91% |
| 2005 | 146.00 | -0.68% |
| 2006 | 136.00 | -6.85% |
| 2007 | 153.00 | 12.50% |
| 2008 | 147.00 | -3.92% |
| 2009 | 150.00 | 2.04% |
| 2010 | 164.00 | 9.33% |
| 2011 | 153.00 | -6.71% |
| 2012 | 159.00 | 3.92% |
| 2013 | 163.00 | 2.52% |
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