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| year | consumption | change |
| 1980 | 11.00 | NA |
| 1981 | 11.00 | 0.00% |
| 1982 | 12.00 | 9.09% |
| 1983 | 13.00 | 8.33% |
| 1984 | 13.00 | 0.00% |
| 1985 | 14.00 | 7.69% |
| 1986 | 14.00 | 0.00% |
| 1987 | 15.00 | 7.14% |
| 1988 | 17.00 | 13.33% |
| 1989 | 18.00 | 5.88% |
| 1990 | 18.00 | 0.00% |
| 1991 | 19.00 | 5.56% |
| 1992 | 22.00 | 15.79% |
| 1993 | 23.00 | 4.55% |
| 1994 | 25.00 | 8.70% |
| 1995 | 27.00 | 8.00% |
| 1996 | 28.00 | 3.70% |
| 1997 | 30.00 | 7.14% |
| 1998 | 32.00 | 6.67% |
| 1999 | 34.00 | 6.25% |
| 2000 | 37.00 | 8.82% |
| 2001 | 39.00 | 5.41% |
| 2002 | 40.00 | 2.56% |
| 2003 | 41.00 | 2.50% |
| 2004 | 42.00 | 2.44% |
| 2005 | 43.00 | 2.38% |
| 2006 | 44.00 | 2.33% |
| 2007 | 47.00 | 6.82% |
| 2008 | 49.00 | 4.26% |
| 2009 | 46.00 | -6.12% |
| 2010 | 49.00 | 6.52% |
| 2011 | 50.00 | 2.04% |
| 2012 | 53.00 | 6.00% |
| 2013 | 49.00 | -7.55% |
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