|
| year | consumption | change |
| 1980 | 1,934.00 | NA |
| 1981 | 1,874.00 | -3.10 % |
| 1982 | 1,781.00 | -4.96 % |
| 1983 | 1,750.00 | -1.74 % |
| 1984 | 1,720.00 | -1.71 % |
| 1985 | 1,705.00 | -0.87 % |
| 1986 | 1,734.00 | 1.70 % |
| 1987 | 1,815.00 | 4.67 % |
| 1988 | 1,829.00 | 0.77 % |
| 1989 | 1,897.00 | 3.72 % |
| 1990 | 1,868.00 | -1.53 % |
| 1991 | 1,856.00 | -0.64 % |
| 1992 | 1,894.00 | 2.05 % |
| 1993 | 1,891.00 | -0.16 % |
| 1994 | 1,869.00 | -1.16 % |
| 1995 | 1,942.00 | 3.91 % |
| 1996 | 1,920.00 | -1.13 % |
| 1997 | 1,934.00 | 0.73 % |
| 1998 | 1,943.00 | 0.47 % |
| 1999 | 1,891.00 | -2.68 % |
| 2000 | 1,853.77 | -1.97 % |
| 2001 | 1,832.44 | -1.15 % |
| 2002 | 1,870.13 | 2.06 % |
| 2003 | 1,859.66 | -0.56 % |
| 2004 | 1,828.92 | -1.65 % |
| 2005 | 1,780.57 | -2.64 % |
| 2006 | 1,776.59 | -0.22 % |
| 2007 | 1,728.70 | -2.70 % |
| 2008 | 1,666.79 | -3.58 % |
| 2009 | 1,544.24 | -7.35 % |
| 2010 | 1,544.24 | 0.00 % |
| 2011 | 1,453.61 | -5.87 % |
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