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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 9.80 | -2.00% |
| 1982 | 12.00 | 22.45% |
| 1983 | 14.00 | 16.67% |
| 1984 | 16.00 | 14.29% |
| 1985 | 19.00 | 18.75% |
| 1986 | 20.00 | 5.26% |
| 1987 | 22.00 | 10.00% |
| 1988 | 25.00 | 13.64% |
| 1989 | 26.00 | 4.00% |
| 1990 | 20.00 | -23.08% |
| 1991 | 18.00 | -10.00% |
| 1992 | 23.00 | 27.78% |
| 1993 | 24.00 | 4.35% |
| 1994 | 25.00 | 4.17% |
| 1995 | 26.00 | 4.00% |
| 1996 | 26.00 | 0.00% |
| 1997 | 27.00 | 3.85% |
| 1998 | 27.00 | 0.00% |
| 1999 | 26.00 | -3.70% |
| 2000 | 27.00 | 3.85% |
| 2001 | 28.00 | 3.70% |
| 2002 | 30.00 | 7.14% |
| 2003 | 25.00 | -16.67% |
| 2004 | 30.00 | 20.00% |
| 2005 | 21.00 | -30.00% |
| 2006 | 25.00 | 19.05% |
| 2007 | 20.00 | -20.00% |
| 2008 | 20.00 | 0.00% |
| 2009 | 30.00 | 50.00% |
| 2010 | 34.00 | 13.33% |
| 2011 | 40.00 | 17.65% |
| 2012 | 45.00 | 12.50% |
| 2013 | 57.00 | 26.67% |
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