|
| year | consumption | change |
| 1980 | 6,589.18 | NA |
| 1981 | 6,058.97 | -8.05 % |
| 1982 | 6,978.16 | 15.17 % |
| 1983 | 9,599.87 | 37.57 % |
| 1984 | 11,389.75 | 18.64 % |
| 1985 | 12,104.36 | 6.27 % |
| 1986 | 14,872.52 | 22.87 % |
| 1987 | 16,211.19 | 9.00 % |
| 1988 | 18,577.99 | 14.60 % |
| 1989 | 19,680.51 | 5.93 % |
| 1990 | 18,935.60 | -3.78 % |
| 1991 | 20,659.09 | 9.10 % |
| 1992 | 24,175.97 | 17.02 % |
| 1993 | 26,702.30 | 10.45 % |
| 1994 | 28,151.99 | 5.43 % |
| 1995 | 29,029.96 | 3.12 % |
| 1996 | 32,948.56 | 13.50 % |
| 1997 | 37,424.26 | 13.58 % |
| 1998 | 40,567.72 | 8.40 % |
| 1999 | 43,695.52 | 7.71 % |
| 2000 | 51,956.89 | 18.91 % |
| 2001 | 53,551.99 | 3.07 % |
| 2002 | 59,514.87 | 11.13 % |
| 2003 | 63,150.95 | 6.11 % |
| 2004 | 64,671.49 | 2.41 % |
| 2005 | 66,012.55 | 2.07 % |
| 2006 | 69,084.29 | 4.65 % |
| 2007 | 72,281.30 | 4.63 % |
| 2008 | 69,396.03 | -3.99 % |
| 2009 | 66,198.84 | -4.61 % |
| 2010 | 70,002.72 | 5.75 % |
| 2011 | 73,330.63 | 4.75 % |
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