|
| year | consumption | change |
| 1980 | 107.00 | NA |
| 1981 | 104.00 | -2.80 % |
| 1982 | 102.00 | -1.92 % |
| 1983 | 96.00 | -5.88 % |
| 1984 | 101.00 | 5.21 % |
| 1985 | 98.00 | -2.97 % |
| 1986 | 104.00 | 6.12 % |
| 1987 | 108.00 | 3.85 % |
| 1988 | 120.00 | 11.11 % |
| 1989 | 135.00 | 12.50 % |
| 1990 | 145.00 | 7.41 % |
| 1991 | 153.00 | 5.52 % |
| 1992 | 165.00 | 7.84 % |
| 1993 | 179.00 | 8.48 % |
| 1994 | 196.00 | 9.50 % |
| 1995 | 212.00 | 8.16 % |
| 1996 | 232.00 | 9.43 % |
| 1997 | 245.00 | 5.60 % |
| 1998 | 255.00 | 4.08 % |
| 1999 | 261.00 | 2.35 % |
| 2000 | 239.63 | -8.19 % |
| 2001 | 233.44 | -2.58 % |
| 2002 | 239.65 | 2.66 % |
| 2003 | 248.50 | 3.69 % |
| 2004 | 263.42 | 6.00 % |
| 2005 | 272.35 | 3.39 % |
| 2006 | 278.67 | 2.32 % |
| 2007 | 351.67 | 26.19 % |
| 2008 | 369.88 | 5.18 % |
| 2009 | 367.61 | -0.61 % |
| 2010 | 322.39 | -12.30 % |
| 2011 | 332.72 | 3.20 % |
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