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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.60 | 14.29% |
| 1982 | 1.70 | 6.25% |
| 1983 | 1.90 | 11.76% |
| 1984 | 2.20 | 15.79% |
| 1985 | 2.60 | 18.18% |
| 1986 | 2.80 | 7.69% |
| 1987 | 2.80 | 0.00% |
| 1988 | 3.10 | 10.71% |
| 1989 | 3.10 | 0.00% |
| 1990 | 3.00 | -3.23% |
| 1991 | 3.10 | 3.33% |
| 1992 | 3.50 | 12.90% |
| 1993 | 3.80 | 8.57% |
| 1994 | 4.10 | 7.89% |
| 1995 | 4.30 | 4.88% |
| 1996 | 4.50 | 4.65% |
| 1997 | 4.70 | 4.44% |
| 1998 | 5.00 | 6.38% |
| 1999 | 5.20 | 4.00% |
| 2000 | 5.40 | 3.85% |
| 2001 | 5.80 | 7.41% |
| 2002 | 6.30 | 8.62% |
| 2003 | 7.00 | 11.11% |
| 2004 | 7.50 | 7.14% |
| 2005 | 7.90 | 5.33% |
| 2006 | 8.70 | 10.13% |
| 2007 | 10.00 | 14.94% |
| 2008 | 9.60 | -4.00% |
| 2009 | 10.00 | 4.17% |
| 2010 | 11.00 | 10.00% |
| 2011 | 12.00 | 9.09% |
| 2012 | 12.00 | 0.00% |
| 2013 | 13.00 | 8.33% |
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