|
| year | consumption | change |
| 1980 | 84.00 | NA |
| 1981 | 88.00 | 4.76 % |
| 1982 | 95.00 | 7.95 % |
| 1983 | 85.00 | -10.53 % |
| 1984 | 83.00 | -2.35 % |
| 1985 | 86.00 | 3.61 % |
| 1986 | 91.77 | 6.71 % |
| 1987 | 90.19 | -1.73 % |
| 1988 | 93.21 | 3.36 % |
| 1989 | 90.17 | -3.27 % |
| 1990 | 97.32 | 7.93 % |
| 1991 | 104.00 | 6.86 % |
| 1992 | 119.15 | 14.57 % |
| 1993 | 111.86 | -6.12 % |
| 1994 | 119.76 | 7.07 % |
| 1995 | 123.38 | 3.02 % |
| 1996 | 129.17 | 4.70 % |
| 1997 | 134.88 | 4.42 % |
| 1998 | 137.23 | 1.75 % |
| 1999 | 128.40 | -6.44 % |
| 2000 | 130.54 | 1.67 % |
| 2001 | 139.97 | 7.23 % |
| 2002 | 141.73 | 1.26 % |
| 2003 | 146.06 | 3.05 % |
| 2004 | 151.90 | 4.00 % |
| 2005 | 159.41 | 4.94 % |
| 2006 | 173.54 | 8.87 % |
| 2007 | 181.18 | 4.41 % |
| 2008 | 219.78 | 21.30 % |
| 2009 | 208.13 | -5.30 % |
| 2010 | 226.42 | 8.79 % |
| 2011 | 201.00 | -11.23 % |
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