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| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.00 | -9.09% |
| 1982 | 1.10 | 10.00% |
| 1983 | 1.10 | 0.00% |
| 1984 | 1.20 | 9.09% |
| 1985 | 1.50 | 25.00% |
| 1986 | 1.50 | 0.00% |
| 1987 | 1.60 | 6.67% |
| 1988 | 1.40 | -12.50% |
| 1989 | 1.50 | 7.14% |
| 1990 | 1.70 | 13.33% |
| 1991 | 1.60 | -5.88% |
| 1992 | 1.80 | 12.50% |
| 1993 | 2.10 | 16.67% |
| 1994 | 2.20 | 4.76% |
| 1995 | 2.30 | 4.55% |
| 1996 | 2.40 | 4.35% |
| 1997 | 2.70 | 12.50% |
| 1998 | 2.80 | 3.70% |
| 1999 | 2.90 | 3.57% |
| 2000 | 3.30 | 13.79% |
| 2001 | 3.00 | -9.09% |
| 2002 | 3.60 | 20.00% |
| 2003 | 4.00 | 11.11% |
| 2004 | 3.90 | -2.50% |
| 2005 | 3.50 | -10.26% |
| 2006 | 4.20 | 20.00% |
| 2007 | 4.20 | 0.00% |
| 2008 | 4.50 | 7.14% |
| 2009 | 4.80 | 6.67% |
| 2010 | 6.10 | 27.08% |
| 2011 | 7.70 | 26.23% |
| 2012 | 7.80 | 1.30% |
| 2013 | 8.40 | 7.69% |
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