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| year | consumption | change |
| 1980 | 5.00 | NA |
| 1981 | 6.00 | 20.00% |
| 1982 | 5.00 | -16.67% |
| 1983 | 4.00 | -20.00% |
| 1984 | 4.00 | 0.00% |
| 1985 | 5.70 | 42.50% |
| 1986 | 5.80 | 1.75% |
| 1987 | 6.50 | 12.07% |
| 1988 | 5.80 | -10.77% |
| 1989 | 6.50 | 12.07% |
| 1990 | 7.10 | 9.23% |
| 1991 | 6.20 | -12.68% |
| 1992 | 5.80 | -6.45% |
| 1993 | 5.40 | -6.90% |
| 1994 | 5.30 | -1.85% |
| 1995 | 5.20 | -1.89% |
| 1996 | 5.00 | -3.85% |
| 1997 | 5.00 | 0.00% |
| 1998 | 5.10 | 2.00% |
| 1999 | 4.20 | -17.65% |
| 2000 | 4.40 | 4.76% |
| 2001 | 5.60 | 27.27% |
| 2002 | 4.80 | -14.29% |
| 2003 | 6.00 | 25.00% |
| 2004 | 6.70 | 11.67% |
| 2005 | 7.60 | 13.43% |
| 2006 | 8.20 | 7.89% |
| 2007 | 9.10 | 10.98% |
| 2008 | 10.00 | 9.89% |
| 2009 | 12.00 | 20.00% |
| 2010 | 17.00 | 41.67% |
| 2011 | 14.00 | -17.65% |
| 2012 | 15.00 | 7.14% |
| 2013 | 15.00 | 0.00% |
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