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| year | consumption | change |
| 1980 | 35.00 | NA |
| 1981 | 36.00 | 2.86% |
| 1982 | 36.00 | 0.00% |
| 1983 | 37.00 | 2.78% |
| 1984 | 39.00 | 5.41% |
| 1985 | 40.00 | 2.56% |
| 1986 | 41.00 | 2.50% |
| 1987 | 43.00 | 4.88% |
| 1988 | 44.00 | 2.33% |
| 1989 | 46.00 | 4.55% |
| 1990 | 47.00 | 2.17% |
| 1991 | 48.00 | 2.13% |
| 1992 | 48.00 | 0.00% |
| 1993 | 48.00 | 0.00% |
| 1994 | 48.00 | 0.00% |
| 1995 | 49.00 | 2.08% |
| 1996 | 49.00 | 0.00% |
| 1997 | 49.00 | 0.00% |
| 1998 | 50.00 | 2.04% |
| 1999 | 52.00 | 4.00% |
| 2000 | 53.00 | 1.92% |
| 2001 | 54.00 | 1.89% |
| 2002 | 54.00 | 0.00% |
| 2003 | 55.00 | 1.85% |
| 2004 | 56.00 | 1.82% |
| 2005 | 58.00 | 3.57% |
| 2006 | 58.00 | 0.00% |
| 2007 | 58.00 | 0.00% |
| 2008 | 58.00 | 0.00% |
| 2009 | 57.00 | -1.72% |
| 2010 | 59.00 | 3.51% |
| 2011 | 58.00 | -1.69% |
| 2012 | 58.00 | 0.00% |
| 2013 | 58.00 | 0.00% |
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