|
| year | consumption | change |
| 1980 | 707.68 | NA |
| 1981 | 816.81 | 15.42 % |
| 1982 | 946.89 | 15.92 % |
| 1983 | 1,382.30 | 45.98 % |
| 1984 | 2,257.72 | 63.33 % |
| 1985 | 2,738.76 | 21.31 % |
| 1986 | 2,176.51 | -20.53 % |
| 1987 | 2,323.23 | 6.74 % |
| 1988 | 2,934.01 | 26.29 % |
| 1989 | 2,392.03 | -18.47 % |
| 1990 | 2,730.43 | 14.15 % |
| 1991 | 3,031.54 | 11.03 % |
| 1992 | 2,996.08 | -1.17 % |
| 1993 | 3,154.82 | 5.30 % |
| 1994 | 3,387.40 | 7.37 % |
| 1995 | 3,820.61 | 12.79 % |
| 1996 | 5,127.95 | 34.22 % |
| 1997 | 5,908.39 | 15.22 % |
| 1998 | 5,282.28 | -10.60 % |
| 1999 | 6,923.62 | 31.07 % |
| 2000 | 9,551.53 | 37.96 % |
| 2001 | 9,958.28 | 4.26 % |
| 2002 | 9,283.67 | -6.77 % |
| 2003 | 9,809.47 | 5.66 % |
| 2004 | 10,514.95 | 7.19 % |
| 2005 | 11,028.63 | 4.89 % |
| 2006 | 11,229.25 | 1.82 % |
| 2007 | 11,542.30 | 2.79 % |
| 2008 | 13,161.60 | 14.03 % |
| 2009 | 11,275.54 | -14.33 % |
| 2010 | 15,086.23 | 33.80 % |
| 2011 | 16,483.96 | 9.26 % |
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