|
| year | consumption | change |
| 1980 | 25.00 | NA |
| 1981 | 26.50 | 6.00 % |
| 1982 | 25.10 | -5.28 % |
| 1983 | 24.50 | -2.39 % |
| 1984 | 24.00 | -2.04 % |
| 1985 | 21.52 | -10.34 % |
| 1986 | 21.11 | -1.89 % |
| 1987 | 21.31 | 0.92 % |
| 1988 | 23.11 | 8.48 % |
| 1989 | 24.34 | 5.28 % |
| 1990 | 25.18 | 3.49 % |
| 1991 | 25.59 | 1.62 % |
| 1992 | 26.28 | 2.68 % |
| 1993 | 27.43 | 4.36 % |
| 1994 | 30.45 | 11.03 % |
| 1995 | 32.71 | 7.43 % |
| 1996 | 34.79 | 6.34 % |
| 1997 | 36.45 | 4.78 % |
| 1998 | 40.41 | 10.87 % |
| 1999 | 43.47 | 7.58 % |
| 2000 | 48.10 | 10.66 % |
| 2001 | 46.74 | -2.83 % |
| 2002 | 46.72 | -0.04 % |
| 2003 | 46.26 | -1.00 % |
| 2004 | 49.62 | 7.27 % |
| 2005 | 50.80 | 2.38 % |
| 2006 | 58.05 | 14.28 % |
| 2007 | 59.69 | 2.83 % |
| 2008 | 61.61 | 3.20 % |
| 2009 | 50.53 | -17.98 % |
| 2010 | 54.35 | 7.57 % |
| 2011 | 62.00 | 14.07 % |
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