|
| year | consumption | change |
| 1980 | 37.00 | NA |
| 1981 | 40.00 | 8.11 % |
| 1982 | 42.52 | 6.30 % |
| 1983 | 46.83 | 10.13 % |
| 1984 | 52.27 | 11.61 % |
| 1985 | 54.70 | 4.66 % |
| 1986 | 55.94 | 2.26 % |
| 1987 | 60.04 | 7.32 % |
| 1988 | 60.42 | 0.65 % |
| 1989 | 65.79 | 8.88 % |
| 1990 | 70.42 | 7.03 % |
| 1991 | 78.99 | 12.17 % |
| 1992 | 83.10 | 5.20 % |
| 1993 | 87.05 | 4.76 % |
| 1994 | 85.99 | -1.22 % |
| 1995 | 94.71 | 10.14 % |
| 1996 | 102.48 | 8.20 % |
| 1997 | 98.95 | -3.45 % |
| 1998 | 101.88 | 2.96 % |
| 1999 | 105.56 | 3.60 % |
| 2000 | 104.96 | -0.57 % |
| 2001 | 109.23 | 4.07 % |
| 2002 | 107.22 | -1.84 % |
| 2003 | 113.33 | 5.70 % |
| 2004 | 116.93 | 3.18 % |
| 2005 | 120.04 | 2.66 % |
| 2006 | 116.72 | -2.77 % |
| 2007 | 113.68 | -2.60 % |
| 2008 | 121.20 | 6.62 % |
| 2009 | 116.36 | -3.99 % |
| 2010 | 130.03 | 11.75 % |
| 2011 | 115.48 | -11.19 % |
|
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