|
| year | consumption | change |
| 1980 | 119.00 | NA |
| 1981 | 104.00 | -12.61 % |
| 1982 | 92.00 | -11.54 % |
| 1983 | 83.00 | -9.78 % |
| 1984 | 85.00 | 2.41 % |
| 1985 | 84.00 | -1.18 % |
| 1986 | 99.00 | 17.86 % |
| 1987 | 89.00 | -10.10 % |
| 1988 | 80.00 | -10.11 % |
| 1989 | 83.00 | 3.75 % |
| 1990 | 92.00 | 10.84 % |
| 1991 | 99.00 | 7.61 % |
| 1992 | 101.00 | 2.02 % |
| 1993 | 104.00 | 2.97 % |
| 1994 | 114.00 | 9.62 % |
| 1995 | 117.00 | 2.63 % |
| 1996 | 122.00 | 4.27 % |
| 1997 | 134.00 | 9.84 % |
| 1998 | 150.00 | 11.94 % |
| 1999 | 168.00 | 12.00 % |
| 2000 | 169.98 | 1.18 % |
| 2001 | 182.43 | 7.32 % |
| 2002 | 179.41 | -1.66 % |
| 2003 | 176.24 | -1.76 % |
| 2004 | 181.75 | 3.13 % |
| 2005 | 191.91 | 5.59 % |
| 2006 | 202.21 | 5.36 % |
| 2007 | 194.03 | -4.04 % |
| 2008 | 191.43 | -1.34 % |
| 2009 | 162.68 | -15.02 % |
| 2010 | 161.44 | -0.76 % |
| 2011 | 144.99 | -10.19 % |
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