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| year | consumption | change |
| 1980 | 16.00 | NA |
| 1981 | 14.00 | -12.50% |
| 1982 | 16.00 | 14.29% |
| 1983 | 14.00 | -12.50% |
| 1984 | 16.00 | 14.29% |
| 1985 | 14.00 | -12.50% |
| 1986 | 16.00 | 14.29% |
| 1987 | 18.00 | 12.50% |
| 1988 | 21.00 | 16.67% |
| 1989 | 24.00 | 14.29% |
| 1990 | 20.00 | -16.67% |
| 1991 | 20.00 | 0.00% |
| 1992 | 22.00 | 10.00% |
| 1993 | 23.00 | 4.55% |
| 1994 | 26.00 | 13.04% |
| 1995 | 27.00 | 3.85% |
| 1996 | 27.00 | 0.00% |
| 1997 | 26.00 | -3.70% |
| 1998 | 27.00 | 3.85% |
| 1999 | 31.00 | 14.81% |
| 2000 | 37.00 | 19.35% |
| 2001 | 36.00 | -2.70% |
| 2002 | 39.00 | 8.33% |
| 2003 | 42.00 | 7.69% |
| 2004 | 45.00 | 7.14% |
| 2005 | 46.00 | 2.22% |
| 2006 | 47.00 | 2.17% |
| 2007 | 48.00 | 2.13% |
| 2008 | 44.00 | -8.33% |
| 2009 | 54.00 | 22.73% |
| 2010 | 65.00 | 20.37% |
| 2011 | 69.00 | 6.15% |
| 2012 | 78.00 | 13.04% |
| 2013 | 75.00 | -3.85% |
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