|
| year | consumption | change |
| 1980 | 5,189.68 | NA |
| 1981 | 4,981.35 | -4.01 % |
| 1982 | 5,509.35 | 10.60 % |
| 1983 | 5,544.63 | 0.64 % |
| 1984 | 5,549.04 | 0.08 % |
| 1985 | 6,476.08 | 16.71 % |
| 1986 | 5,510.46 | -14.91 % |
| 1987 | 6,149.80 | 11.60 % |
| 1988 | 4,824.82 | -21.55 % |
| 1989 | 5,007.80 | 3.79 % |
| 1990 | 4,607.66 | -7.99 % |
| 1991 | 4,620.89 | 0.29 % |
| 1992 | 4,020.13 | -13.00 % |
| 1993 | 4,389.40 | 9.19 % |
| 1994 | 4,362.95 | -0.60 % |
| 1995 | 6,942.36 | 59.12 % |
| 1996 | 7,518.87 | 8.30 % |
| 1997 | 8,968.41 | 19.28 % |
| 1998 | 9,009.19 | 0.45 % |
| 1999 | 8,321.35 | -7.63 % |
| 2000 | 8,606.85 | 3.43 % |
| 2001 | 9,889.94 | 14.91 % |
| 2002 | 10,858.87 | 9.80 % |
| 2003 | 11,464.04 | 5.57 % |
| 2004 | 13,519.85 | 17.93 % |
| 2005 | 14,904.35 | 10.24 % |
| 2006 | 18,554.11 | 24.49 % |
| 2007 | 19,829.48 | 6.87 % |
| 2008 | 24,992.71 | 26.04 % |
| 2009 | 24,662.01 | -1.32 % |
| 2010 | 29,696.27 | 20.41 % |
| 2011 | 23,930.08 | -19.42 % |
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