|
| year | consumption | change |
| 1980 | 91.00 | NA |
| 1981 | 85.00 | -6.59 % |
| 1982 | 82.00 | -3.53 % |
| 1983 | 82.00 | 0.00 % |
| 1984 | 85.00 | 3.66 % |
| 1985 | 82.00 | -3.53 % |
| 1986 | 83.00 | 1.22 % |
| 1987 | 90.00 | 8.43 % |
| 1988 | 94.00 | 4.44 % |
| 1989 | 99.00 | 5.32 % |
| 1990 | 107.00 | 8.08 % |
| 1991 | 104.00 | -2.80 % |
| 1992 | 109.00 | 4.81 % |
| 1993 | 110.00 | 0.92 % |
| 1994 | 120.00 | 9.09 % |
| 1995 | 125.00 | 4.17 % |
| 1996 | 125.00 | 0.00 % |
| 1997 | 129.00 | 3.20 % |
| 1998 | 129.00 | 0.00 % |
| 1999 | 131.00 | 1.55 % |
| 2000 | 133.82 | 2.15 % |
| 2001 | 134.88 | 0.79 % |
| 2002 | 140.72 | 4.33 % |
| 2003 | 145.53 | 3.42 % |
| 2004 | 150.27 | 3.26 % |
| 2005 | 152.76 | 1.66 % |
| 2006 | 154.32 | 1.02 % |
| 2007 | 156.00 | 1.09 % |
| 2008 | 157.31 | 0.84 % |
| 2009 | 150.66 | -4.23 % |
| 2010 | 152.53 | 1.24 % |
| 2011 | 148.47 | -2.66 % |
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