|
| year | consumption | change |
| 1980 | 2,180.85 | NA |
| 1981 | 2,238.34 | 2.64 % |
| 1982 | 2,781.78 | 24.28 % |
| 1983 | 2,473.18 | -11.09 % |
| 1984 | 2,771.60 | 12.07 % |
| 1985 | 3,123.84 | 12.71 % |
| 1986 | 3,326.26 | 6.48 % |
| 1987 | 3,378.26 | 1.56 % |
| 1988 | 3,913.65 | 15.85 % |
| 1989 | 3,874.85 | -0.99 % |
| 1990 | 4,024.94 | 3.87 % |
| 1991 | 4,254.39 | 5.70 % |
| 1992 | 4,473.39 | 5.15 % |
| 1993 | 4,594.85 | 2.72 % |
| 1994 | 4,751.48 | 3.41 % |
| 1995 | 4,550.16 | -4.24 % |
| 1996 | 4,745.58 | 4.29 % |
| 1997 | 4,912.40 | 3.52 % |
| 1998 | 4,818.20 | -1.92 % |
| 1999 | 4,545.93 | -5.65 % |
| 2000 | 4,457.75 | -1.94 % |
| 2001 | 4,860.09 | 9.03 % |
| 2002 | 5,390.30 | 10.91 % |
| 2003 | 6,684.42 | 24.01 % |
| 2004 | 8,701.65 | 30.18 % |
| 2005 | 8,503.23 | -2.28 % |
| 2006 | 8,701.65 | 2.33 % |
| 2007 | 11,145.47 | 28.08 % |
| 2008 | 9,250.60 | -17.00 % |
| 2009 | 8,971.71 | -3.01 % |
| 2010 | 8,507.64 | -5.17 % |
| 2011 | 6,900.47 | -18.89 % |
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