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| year | consumption | change |
| 1980 | 2.70 | NA |
| 1981 | 3.00 | 11.11% |
| 1982 | 3.20 | 6.67% |
| 1983 | 3.30 | 3.13% |
| 1984 | 3.20 | -3.03% |
| 1985 | 3.80 | 18.75% |
| 1986 | 4.10 | 7.89% |
| 1987 | 4.20 | 2.44% |
| 1988 | 4.30 | 2.38% |
| 1989 | 4.30 | 0.00% |
| 1990 | 4.80 | 11.63% |
| 1991 | 5.20 | 8.33% |
| 1992 | 5.40 | 3.85% |
| 1993 | 5.50 | 1.85% |
| 1994 | 6.00 | 9.09% |
| 1995 | 6.10 | 1.67% |
| 1996 | 6.90 | 13.11% |
| 1997 | 6.90 | 0.00% |
| 1998 | 7.40 | 7.25% |
| 1999 | 7.60 | 2.70% |
| 2000 | 7.80 | 2.63% |
| 2001 | 8.00 | 2.56% |
| 2002 | 8.30 | 3.75% |
| 2003 | 8.60 | 3.61% |
| 2004 | 10.00 | 16.28% |
| 2005 | 10.00 | 0.00% |
| 2006 | 12.00 | 20.00% |
| 2007 | 14.00 | 16.67% |
| 2008 | 15.00 | 7.14% |
| 2009 | 16.00 | 6.67% |
| 2010 | 16.00 | 0.00% |
| 2011 | 18.00 | 12.50% |
| 2012 | 19.00 | 5.56% |
| 2013 | 20.00 | 5.26% |
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