|
| year | consumption | change |
| 1980 | 16.60 | NA |
| 1981 | 18.00 | 8.43 % |
| 1982 | 20.60 | 14.44 % |
| 1983 | 22.00 | 6.80 % |
| 1984 | 24.00 | 9.09 % |
| 1985 | 25.00 | 4.17 % |
| 1986 | 27.66 | 10.65 % |
| 1987 | 28.88 | 4.42 % |
| 1988 | 26.87 | -6.95 % |
| 1989 | 27.59 | 2.68 % |
| 1990 | 27.77 | 0.64 % |
| 1991 | 28.02 | 0.88 % |
| 1992 | 30.09 | 7.40 % |
| 1993 | 31.63 | 5.14 % |
| 1994 | 32.44 | 2.56 % |
| 1995 | 34.70 | 6.95 % |
| 1996 | 39.90 | 15.00 % |
| 1997 | 40.32 | 1.05 % |
| 1998 | 41.86 | 3.83 % |
| 1999 | 43.25 | 3.32 % |
| 2000 | 48.17 | 11.38 % |
| 2001 | 54.48 | 13.10 % |
| 2002 | 62.25 | 14.26 % |
| 2003 | 71.88 | 15.47 % |
| 2004 | 82.85 | 15.25 % |
| 2005 | 86.08 | 3.91 % |
| 2006 | 95.00 | 10.35 % |
| 2007 | 121.58 | 27.98 % |
| 2008 | 165.55 | 36.17 % |
| 2009 | 134.20 | -18.93 % |
| 2010 | 123.31 | -8.12 % |
| 2011 | 183.00 | 48.41 % |
|
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