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| year | consumption | change |
| 1980 | 4.10 | NA |
| 1981 | 3.80 | -7.32% |
| 1982 | 3.70 | -2.63% |
| 1983 | 4.00 | 8.11% |
| 1984 | 4.70 | 17.50% |
| 1985 | 4.40 | -6.38% |
| 1986 | 3.60 | -18.18% |
| 1987 | 3.50 | -2.78% |
| 1988 | 3.70 | 5.71% |
| 1989 | 4.30 | 16.22% |
| 1990 | 4.20 | -2.33% |
| 1991 | 6.70 | 59.52% |
| 1992 | 4.80 | -28.36% |
| 1993 | 3.60 | -25.00% |
| 1994 | 4.10 | 13.89% |
| 1995 | 4.10 | 0.00% |
| 1996 | 4.20 | 2.44% |
| 1997 | 4.30 | 2.38% |
| 1998 | 4.30 | 0.00% |
| 1999 | 6.80 | 58.14% |
| 2000 | 9.50 | 39.71% |
| 2001 | 6.80 | -28.42% |
| 2002 | 8.80 | 29.41% |
| 2003 | 14.00 | 59.09% |
| 2004 | 15.00 | 7.14% |
| 2005 | 15.00 | 0.00% |
| 2006 | 16.00 | 6.67% |
| 2007 | 17.00 | 6.25% |
| 2008 | 8.80 | -48.24% |
| 2009 | 9.20 | 4.55% |
| 2010 | 16.00 | 73.91% |
| 2011 | 14.00 | -12.50% |
| 2012 | 13.00 | -7.14% |
| 2013 | 13.00 | 0.00% |
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