|
| year | consumption | change |
| 1980 | 49,335.05 | NA |
| 1981 | 50,900.33 | 3.17 % |
| 1982 | 53,600.99 | 5.31 % |
| 1983 | 55,903.72 | 4.30 % |
| 1984 | 57,387.43 | 2.65 % |
| 1985 | 60,075.97 | 4.68 % |
| 1986 | 59,447.65 | -1.05 % |
| 1987 | 56,835.17 | -4.39 % |
| 1988 | 71,308.52 | 25.47 % |
| 1989 | 57,279.41 | -19.67 % |
| 1990 | 53,674.85 | -6.29 % |
| 1991 | 51,901.23 | -3.30 % |
| 1992 | 45,656.63 | -12.03 % |
| 1993 | 41,938.54 | -8.14 % |
| 1994 | 38,684.52 | -7.76 % |
| 1995 | 35,510.96 | -8.20 % |
| 1996 | 30,645.36 | -13.70 % |
| 1997 | 30,078.77 | -1.85 % |
| 1998 | 27,136.70 | -9.78 % |
| 1999 | 30,541.74 | 12.55 % |
| 2000 | 32,708.88 | 7.10 % |
| 2001 | 33,756.08 | 3.20 % |
| 2002 | 32,151.12 | -4.75 % |
| 2003 | 32,896.28 | 2.32 % |
| 2004 | 33,645.85 | 2.28 % |
| 2005 | 35,505.45 | 5.53 % |
| 2006 | 36,421.47 | 2.58 % |
| 2007 | 29,712.80 | -18.42 % |
| 2008 | 33,164.14 | 11.62 % |
| 2009 | 31,899.79 | -3.81 % |
| 2010 | 30,805.19 | -3.43 % |
| 2011 | 31,321.07 | 1.67 % |
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