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| year | consumption | change |
| 1980 | 15.00 | NA |
| 1981 | 15.00 | 0.00% |
| 1982 | 16.00 | 6.67% |
| 1983 | 17.00 | 6.25% |
| 1984 | 17.00 | 0.00% |
| 1985 | 18.00 | 5.88% |
| 1986 | 19.00 | 5.56% |
| 1987 | 20.00 | 5.26% |
| 1988 | 20.00 | 0.00% |
| 1989 | 23.00 | 15.00% |
| 1990 | 24.00 | 4.35% |
| 1991 | 25.00 | 4.17% |
| 1992 | 26.00 | 4.00% |
| 1993 | 26.00 | 0.00% |
| 1994 | 27.00 | 3.85% |
| 1995 | 29.00 | 7.41% |
| 1996 | 31.00 | 6.90% |
| 1997 | 32.00 | 3.23% |
| 1998 | 34.00 | 6.25% |
| 1999 | 36.00 | 5.88% |
| 2000 | 39.00 | 8.33% |
| 2001 | 40.00 | 2.56% |
| 2002 | 42.00 | 5.00% |
| 2003 | 43.00 | 2.38% |
| 2004 | 45.00 | 4.65% |
| 2005 | 46.00 | 2.22% |
| 2006 | 48.00 | 4.35% |
| 2007 | 49.00 | 2.08% |
| 2008 | 48.00 | -2.04% |
| 2009 | 48.00 | 0.00% |
| 2010 | 50.00 | 4.17% |
| 2011 | 48.00 | -4.00% |
| 2012 | 47.00 | -2.08% |
| 2013 | 46.00 | -2.13% |
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