|
| year | consumption | change |
| 1980 | 17.15 | NA |
| 1981 | 16.66 | -2.84 % |
| 1982 | 19.56 | 17.42 % |
| 1983 | 20.91 | 6.89 % |
| 1984 | 24.62 | 17.73 % |
| 1985 | 29.84 | 21.20 % |
| 1986 | 29.57 | -0.91 % |
| 1987 | 26.62 | -9.98 % |
| 1988 | 26.28 | -1.27 % |
| 1989 | 31.59 | 20.20 % |
| 1990 | 38.64 | 22.32 % |
| 1991 | 38.69 | 0.13 % |
| 1992 | 39.51 | 2.13 % |
| 1993 | 38.90 | -1.55 % |
| 1994 | 39.69 | 2.04 % |
| 1995 | 42.27 | 6.50 % |
| 1996 | 46.66 | 10.39 % |
| 1997 | 48.57 | 4.08 % |
| 1998 | 50.51 | 3.99 % |
| 1999 | 53.40 | 5.74 % |
| 2000 | 52.54 | -1.62 % |
| 2001 | 54.72 | 4.15 % |
| 2002 | 57.23 | 4.59 % |
| 2003 | 58.43 | 2.10 % |
| 2004 | 63.91 | 9.38 % |
| 2005 | 72.06 | 12.76 % |
| 2006 | 78.03 | 8.28 % |
| 2007 | 90.96 | 16.56 % |
| 2008 | 121.64 | 33.73 % |
| 2009 | 108.64 | -10.69 % |
| 2010 | 113.55 | 4.52 % |
| 2011 | 98.00 | -13.69 % |
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