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| year | consumption | change |
| 1980 | 5.00 | NA |
| 1981 | 5.00 | 0.00% |
| 1982 | 5.40 | 8.00% |
| 1983 | 5.00 | -7.41% |
| 1984 | 5.00 | 0.00% |
| 1985 | 5.50 | 10.00% |
| 1986 | 5.90 | 7.27% |
| 1987 | 6.20 | 5.08% |
| 1988 | 7.00 | 12.90% |
| 1989 | 6.80 | -2.86% |
| 1990 | 6.90 | 1.47% |
| 1991 | 7.20 | 4.35% |
| 1992 | 5.30 | -26.39% |
| 1993 | 5.30 | 0.00% |
| 1994 | 5.40 | 1.89% |
| 1995 | 5.70 | 5.56% |
| 1996 | 5.60 | -1.75% |
| 1997 | 5.80 | 3.57% |
| 1998 | 5.80 | 0.00% |
| 1999 | 5.80 | 0.00% |
| 2000 | 6.10 | 5.17% |
| 2001 | 3.60 | -40.98% |
| 2002 | 3.60 | 0.00% |
| 2003 | 4.00 | 11.11% |
| 2004 | 4.10 | 2.50% |
| 2005 | 3.40 | -17.07% |
| 2006 | 4.60 | 35.29% |
| 2007 | 4.00 | -13.04% |
| 2008 | 3.80 | -5.00% |
| 2009 | 4.10 | 7.89% |
| 2010 | 4.40 | 7.32% |
| 2011 | 4.40 | 0.00% |
| 2012 | 4.40 | 0.00% |
| 2013 | 4.40 | 0.00% |
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