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| year | consumption | change |
| 1980 | 3.00 | NA |
| 1981 | 2.00 | -33.33 % |
| 1982 | 2.00 | 0.00 % |
| 1983 | 3.00 | 50.00 % |
| 1984 | 4.00 | 33.33 % |
| 1985 | 4.00 | 0.00 % |
| 1986 | 3.00 | -25.00 % |
| 1987 | 1.90 | -36.67 % |
| 1988 | 2.80 | 47.37 % |
| 1989 | 2.80 | 0.00 % |
| 1990 | 4.00 | 42.86 % |
| 1991 | 3.20 | -20.00 % |
| 1992 | 3.50 | 9.37 % |
| 1993 | 3.50 | 0.00 % |
| 1994 | 3.50 | 0.00 % |
| 1995 | 4.20 | 20.00 % |
| 1996 | 4.20 | 0.00 % |
| 1997 | 3.50 | -16.67 % |
| 1998 | 3.50 | 0.00 % |
| 1999 | 3.50 | 0.00 % |
| 2000 | 4.90 | 40.00 % |
| 2001 | 5.70 | 16.33 % |
| 2002 | 3.50 | -38.60 % |
| 2003 | 5.30 | 51.43 % |
| 2004 | 6.00 | 13.21 % |
| 2005 | 9.20 | 53.33 % |
| 2006 | 9.90 | 7.61 % |
| 2007 | 9.70 | -2.02 % |
| 2008 | 9.20 | -5.15 % |
| 2009 | 10.00 | 8.70 % |
| 2010 | 12.00 | 20.00 % |
| 2011 | 8.50 | -29.17 % |
| 2012 | 18.00 | 111.76 % |
| 2013 | 18.00 | 0.00 % |
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