|
| year | consumption | change |
| 1980 | 202.50 | NA |
| 1981 | 207.00 | 2.22 % |
| 1982 | 223.50 | 7.97 % |
| 1983 | 205.60 | -8.01 % |
| 1984 | 212.80 | 3.50 % |
| 1985 | 217.28 | 2.10 % |
| 1986 | 222.91 | 2.59 % |
| 1987 | 218.61 | -1.93 % |
| 1988 | 221.18 | 1.17 % |
| 1989 | 224.80 | 1.64 % |
| 1990 | 219.55 | -2.34 % |
| 1991 | 203.67 | -7.23 % |
| 1992 | 180.00 | -11.62 % |
| 1993 | 179.45 | -0.30 % |
| 1994 | 182.95 | 1.95 % |
| 1995 | 187.41 | 2.44 % |
| 1996 | 192.42 | 2.67 % |
| 1997 | 200.00 | 3.94 % |
| 1998 | 194.00 | -3.00 % |
| 1999 | 195.00 | 0.51 % |
| 2000 | 195.00 | 0.00 % |
| 2001 | 203.60 | 4.41 % |
| 2002 | 201.51 | -1.02 % |
| 2003 | 204.85 | 1.65 % |
| 2004 | 228.50 | 11.55 % |
| 2005 | 198.04 | -13.33 % |
| 2006 | 157.09 | -20.68 % |
| 2007 | 161.31 | 2.69 % |
| 2008 | 141.40 | -12.35 % |
| 2009 | 169.55 | 19.91 % |
| 2010 | 163.94 | -3.31 % |
| 2011 | 165.00 | 0.65 % |
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