|
| year | consumption | change |
| 1980 | 14.00 | NA |
| 1981 | 12.20 | -12.86 % |
| 1982 | 11.70 | -4.10 % |
| 1983 | 13.00 | 11.11 % |
| 1984 | 13.00 | 0.00 % |
| 1985 | 13.72 | 5.57 % |
| 1986 | 14.94 | 8.86 % |
| 1987 | 14.61 | -2.19 % |
| 1988 | 16.19 | 10.79 % |
| 1989 | 15.76 | -2.62 % |
| 1990 | 16.48 | 4.53 % |
| 1991 | 19.16 | 16.29 % |
| 1992 | 22.05 | 15.04 % |
| 1993 | 22.32 | 1.26 % |
| 1994 | 25.27 | 13.22 % |
| 1995 | 31.11 | 23.11 % |
| 1996 | 30.37 | -2.40 % |
| 1997 | 32.16 | 5.90 % |
| 1998 | 37.79 | 17.52 % |
| 1999 | 38.31 | 1.36 % |
| 2000 | 38.06 | -0.64 % |
| 2001 | 39.41 | 3.53 % |
| 2002 | 39.01 | -1.00 % |
| 2003 | 42.36 | 8.57 % |
| 2004 | 41.93 | -0.99 % |
| 2005 | 43.36 | 3.40 % |
| 2006 | 44.27 | 2.09 % |
| 2007 | 44.78 | 1.15 % |
| 2008 | 41.89 | -6.44 % |
| 2009 | 43.04 | 2.73 % |
| 2010 | 43.19 | 0.35 % |
| 2011 | 49.00 | 13.46 % |
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