|
| year | consumption | change |
| 1980 | 903.00 | NA |
| 1981 | 924.62 | 2.39 % |
| 1982 | 955.84 | 3.38 % |
| 1983 | 1,020.36 | 6.75 % |
| 1984 | 1,372.31 | 34.49 % |
| 1985 | 1,467.60 | 6.94 % |
| 1986 | 1,494.00 | 1.80 % |
| 1987 | 1,543.00 | 3.28 % |
| 1988 | 1,618.00 | 4.86 % |
| 1989 | 1,731.00 | 6.98 % |
| 1990 | 2,028.11 | 17.16 % |
| 1991 | 2,175.23 | 7.25 % |
| 1992 | 2,177.06 | 0.08 % |
| 1993 | 2,217.18 | 1.84 % |
| 1994 | 2,333.62 | 5.25 % |
| 1995 | 2,409.23 | 3.24 % |
| 1996 | 2,524.32 | 4.78 % |
| 1997 | 2,590.21 | 2.61 % |
| 1998 | 2,675.57 | 3.30 % |
| 1999 | 2,818.38 | 5.34 % |
| 2000 | 2,913.91 | 3.39 % |
| 2001 | 2,902.40 | -0.40 % |
| 2002 | 3,099.81 | 6.80 % |
| 2003 | 3,099.81 | 0.00 % |
| 2004 | 3,124.32 | 0.79 % |
| 2005 | 3,110.09 | -0.46 % |
| 2006 | 3,436.64 | 10.50 % |
| 2007 | 3,748.09 | 9.06 % |
| 2008 | 3,667.22 | -2.16 % |
| 2009 | 3,653.02 | -0.39 % |
| 2010 | 3,847.60 | 5.33 % |
| 2011 | 4,361.33 | 13.35 % |
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