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| year | consumption | change |
| 1980 | 16.00 | NA |
| 1981 | 18.00 | 12.50% |
| 1982 | 18.00 | 0.00% |
| 1983 | 20.00 | 11.11% |
| 1984 | 25.00 | 25.00% |
| 1985 | 25.00 | 0.00% |
| 1986 | 30.00 | 20.00% |
| 1987 | 31.00 | 3.33% |
| 1988 | 30.00 | -3.23% |
| 1989 | 32.00 | 6.67% |
| 1990 | 37.00 | 15.63% |
| 1991 | 38.00 | 2.70% |
| 1992 | 39.00 | 2.63% |
| 1993 | 43.00 | 10.26% |
| 1994 | 45.00 | 4.65% |
| 1995 | 47.00 | 4.44% |
| 1996 | 48.00 | 2.13% |
| 1997 | 52.00 | 8.33% |
| 1998 | 55.00 | 5.77% |
| 1999 | 60.00 | 9.09% |
| 2000 | 63.00 | 5.00% |
| 2001 | 68.00 | 7.94% |
| 2002 | 72.00 | 5.88% |
| 2003 | 78.00 | 8.33% |
| 2004 | 83.00 | 6.41% |
| 2005 | 89.00 | 7.23% |
| 2006 | 96.00 | 7.87% |
| 2007 | 105.00 | 9.38% |
| 2008 | 110.00 | 4.76% |
| 2009 | 117.00 | 6.36% |
| 2010 | 122.00 | 4.27% |
| 2011 | 134.00 | 9.84% |
| 2012 | 137.00 | 2.24% |
| 2013 | 140.00 | 2.19% |
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