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| year | consumption | change |
| 1980 | 9.90 | NA |
| 1981 | 9.10 | -8.08% |
| 1982 | 9.00 | -1.10% |
| 1983 | 9.50 | 5.56% |
| 1984 | 10.00 | 5.26% |
| 1985 | 11.00 | 10.00% |
| 1986 | 11.00 | 0.00% |
| 1987 | 14.00 | 27.27% |
| 1988 | 13.00 | -7.14% |
| 1989 | 17.00 | 30.77% |
| 1990 | 16.00 | -5.88% |
| 1991 | 15.00 | -6.25% |
| 1992 | 17.00 | 13.33% |
| 1993 | 18.00 | 5.88% |
| 1994 | 20.00 | 11.11% |
| 1995 | 23.00 | 15.00% |
| 1996 | 19.00 | -17.39% |
| 1997 | 21.00 | 10.53% |
| 1998 | 24.00 | 14.29% |
| 1999 | 27.00 | 12.50% |
| 2000 | 25.00 | -7.41% |
| 2001 | 24.00 | -4.00% |
| 2002 | 25.00 | 4.17% |
| 2003 | 26.00 | 4.00% |
| 2004 | 26.00 | 0.00% |
| 2005 | 26.00 | 0.00% |
| 2006 | 26.00 | 0.00% |
| 2007 | 26.00 | 0.00% |
| 2008 | 28.00 | 7.69% |
| 2009 | 29.00 | 3.57% |
| 2010 | 31.00 | 6.90% |
| 2011 | 34.00 | 9.68% |
| 2012 | 36.00 | 5.88% |
| 2013 | 35.00 | -2.78% |
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