|
| year | consumption | change |
| 1980 | 174.17 | NA |
| 1981 | 175.27 | 0.63 % |
| 1982 | 169.76 | -3.14 % |
| 1983 | 174.17 | 2.60 % |
| 1984 | 184.09 | 5.70 % |
| 1985 | 151.02 | -17.96 % |
| 1986 | 189.60 | 25.55 % |
| 1987 | 202.83 | 6.98 % |
| 1988 | 198.42 | -2.17 % |
| 1989 | 253.53 | 27.78 % |
| 1990 | 239.20 | -5.65 % |
| 1991 | 125.66 | -47.47 % |
| 1992 | 73.97 | -41.14 % |
| 1993 | 92.70 | 25.34 % |
| 1994 | 118.50 | 27.82 % |
| 1995 | 108.47 | -8.47 % |
| 1996 | 42.66 | -60.67 % |
| 1997 | 33.73 | -20.93 % |
| 1998 | 37.92 | 12.42 % |
| 1999 | 40.12 | 5.81 % |
| 2000 | 41.78 | 4.12 % |
| 2001 | 28.33 | -32.19 % |
| 2002 | 45.97 | 62.26 % |
| 2003 | 26.29 | -42.81 % |
| 2004 | 32.19 | 22.43 % |
| 2005 | 45.43 | 41.13 % |
| 2006 | 40.79 | -10.22 % |
| 2007 | 44.58 | 9.30 % |
| 2008 | 39.41 | -11.60 % |
| 2009 | 30.47 | -22.69 % |
| 2010 | 26.50 | -13.02 % |
| 2011 | 26.89 | 1.46 % |
|
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