|
| year | consumption | change |
| 1980 | 28.00 | NA |
| 1981 | 33.00 | 17.86 % |
| 1982 | 41.00 | 24.24 % |
| 1983 | 51.00 | 24.39 % |
| 1984 | 47.00 | -7.84 % |
| 1985 | 55.00 | 17.02 % |
| 1986 | 70.00 | 27.27 % |
| 1987 | 79.80 | 14.00 % |
| 1988 | 73.10 | -8.40 % |
| 1989 | 98.54 | 34.80 % |
| 1990 | 99.00 | 0.47 % |
| 1991 | 124.00 | 25.25 % |
| 1992 | 116.89 | -5.73 % |
| 1993 | 139.85 | 19.64 % |
| 1994 | 146.56 | 4.80 % |
| 1995 | 129.61 | -11.57 % |
| 1996 | 127.84 | -1.37 % |
| 1997 | 158.56 | 24.03 % |
| 1998 | 231.67 | 46.10 % |
| 1999 | 181.52 | -21.65 % |
| 2000 | 221.43 | 21.98 % |
| 2001 | 223.90 | 1.12 % |
| 2002 | 230.96 | 3.15 % |
| 2003 | 225.66 | -2.29 % |
| 2004 | 236.26 | 4.69 % |
| 2005 | 323.84 | 37.07 % |
| 2006 | 380.34 | 17.45 % |
| 2007 | 384.31 | 1.04 % |
| 2008 | 477.46 | 24.24 % |
| 2009 | 520.19 | 8.95 % |
| 2010 | 620.84 | 19.35 % |
| 2011 | 619.43 | -0.23 % |
|
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