|
| year | consumption | change |
| 1980 | 40.90 | NA |
| 1981 | 39.00 | -4.65 % |
| 1982 | 39.00 | 0.00 % |
| 1983 | 37.00 | -5.13 % |
| 1984 | 36.00 | -2.70 % |
| 1985 | 37.00 | 2.78 % |
| 1986 | 39.20 | 5.94 % |
| 1987 | 34.52 | -11.92 % |
| 1988 | 38.27 | 10.84 % |
| 1989 | 41.78 | 9.19 % |
| 1990 | 41.98 | 0.47 % |
| 1991 | 36.74 | -12.48 % |
| 1992 | 40.58 | 10.44 % |
| 1993 | 41.87 | 3.20 % |
| 1994 | 43.79 | 4.58 % |
| 1995 | 46.23 | 5.56 % |
| 1996 | 48.22 | 4.31 % |
| 1997 | 44.02 | -8.71 % |
| 1998 | 51.33 | 16.62 % |
| 1999 | 52.24 | 1.78 % |
| 2000 | 56.80 | 8.72 % |
| 2001 | 51.93 | -8.58 % |
| 2002 | 51.17 | -1.45 % |
| 2003 | 54.20 | 5.92 % |
| 2004 | 59.18 | 9.18 % |
| 2005 | 65.81 | 11.21 % |
| 2006 | 73.15 | 11.16 % |
| 2007 | 73.06 | -0.13 % |
| 2008 | 67.82 | -7.17 % |
| 2009 | 75.64 | 11.54 % |
| 2010 | 79.85 | 5.55 % |
| 2011 | 82.00 | 2.70 % |
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