|
| year | consumption | change |
| 1980 | 40,742.53 | NA |
| 1981 | 40,439.80 | -0.74 % |
| 1982 | 43,737.02 | 8.15 % |
| 1983 | 43,823.80 | 0.20 % |
| 1984 | 45,319.34 | 3.41 % |
| 1985 | 43,649.32 | -3.68 % |
| 1986 | 47,026.81 | 7.74 % |
| 1987 | 48,852.23 | 3.88 % |
| 1988 | 44,872.89 | -8.15 % |
| 1989 | 45,551.91 | 1.51 % |
| 1990 | 41,626.58 | -8.62 % |
| 1991 | 33,121.48 | -20.43 % |
| 1992 | 33,519.20 | 1.20 % |
| 1993 | 32,206.34 | -3.92 % |
| 1994 | 30,765.51 | -4.47 % |
| 1995 | 32,736.23 | 6.41 % |
| 1996 | 33,079.26 | 1.05 % |
| 1997 | 37,642.83 | 13.80 % |
| 1998 | 36,833.70 | -2.15 % |
| 1999 | 31,913.68 | -13.36 % |
| 2000 | 32,261.35 | 1.09 % |
| 2001 | 34,665.77 | 7.45 % |
| 2002 | 31,701.01 | -8.55 % |
| 2003 | 35,124.34 | 10.80 % |
| 2004 | 33,834.21 | -3.67 % |
| 2005 | 32,335.20 | -4.43 % |
| 2006 | 33,283.19 | 2.93 % |
| 2007 | 37,165.53 | 11.66 % |
| 2008 | 36,385.09 | -2.10 % |
| 2009 | 33,241.30 | -8.64 % |
| 2010 | 35,992.67 | 8.28 % |
| 2011 | 45,184.84 | 25.54 % |
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