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| year | consumption | change |
| 1980 | 20.00 | NA |
| 1981 | 21.00 | 5.00% |
| 1982 | 24.00 | 14.29% |
| 1983 | 28.00 | 16.67% |
| 1984 | 31.00 | 10.71% |
| 1985 | 32.00 | 3.23% |
| 1986 | 31.00 | -3.13% |
| 1987 | 31.00 | 0.00% |
| 1988 | 39.00 | 25.81% |
| 1989 | 40.00 | 2.56% |
| 1990 | 50.00 | 25.00% |
| 1991 | 54.00 | 8.00% |
| 1992 | 59.00 | 9.26% |
| 1993 | 62.00 | 5.08% |
| 1994 | 66.00 | 6.45% |
| 1995 | 64.00 | -3.03% |
| 1996 | 70.00 | 9.38% |
| 1997 | 73.00 | 4.29% |
| 1998 | 78.00 | 6.85% |
| 1999 | 85.00 | 8.97% |
| 2000 | 94.00 | 10.59% |
| 2001 | 102.00 | 8.51% |
| 2002 | 109.00 | 6.86% |
| 2003 | 120.00 | 10.09% |
| 2004 | 127.00 | 5.83% |
| 2005 | 135.00 | 6.30% |
| 2006 | 146.00 | 8.15% |
| 2007 | 153.00 | 4.79% |
| 2008 | 162.00 | 5.88% |
| 2009 | 170.00 | 4.94% |
| 2010 | 183.00 | 7.65% |
| 2011 | 186.00 | 1.64% |
| 2012 | 195.00 | 4.84% |
| 2013 | 207.00 | 6.15% |
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