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| year | consumption | change |
| 1980 | 3.30 | NA |
| 1981 | 3.50 | 6.06 % |
| 1982 | 3.70 | 5.71 % |
| 1983 | 4.00 | 8.11 % |
| 1984 | 4.00 | 0.00 % |
| 1985 | 4.20 | 5.00 % |
| 1986 | 4.20 | 0.00 % |
| 1987 | 4.50 | 7.14 % |
| 1988 | 5.00 | 11.11 % |
| 1989 | 5.80 | 16.00 % |
| 1990 | 6.30 | 8.62 % |
| 1991 | 6.70 | 6.35 % |
| 1992 | 6.90 | 2.99 % |
| 1993 | 7.90 | 14.49 % |
| 1994 | 9.20 | 16.46 % |
| 1995 | 11.00 | 19.57 % |
| 1996 | 13.00 | 18.18 % |
| 1997 | 15.00 | 15.38 % |
| 1998 | 17.00 | 13.33 % |
| 1999 | 19.00 | 11.76 % |
| 2000 | 22.00 | 15.79 % |
| 2001 | 25.00 | 13.64 % |
| 2002 | 30.00 | 20.00 % |
| 2003 | 34.00 | 13.33 % |
| 2004 | 39.00 | 14.71 % |
| 2005 | 45.00 | 15.38 % |
| 2006 | 52.00 | 15.56 % |
| 2007 | 59.00 | 13.46 % |
| 2008 | 66.00 | 11.86 % |
| 2009 | 75.00 | 13.64 % |
| 2010 | 86.00 | 14.67 % |
| 2011 | 95.00 | 10.47 % |
| 2012 | 106.00 | 11.58 % |
| 2013 | 112.00 | 5.66 % |
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