|
| year | consumption | change |
| 1980 | 181.37 | NA |
| 1981 | 243.73 | 34.38 % |
| 1982 | 264.42 | 8.49 % |
| 1983 | 321.14 | 21.45 % |
| 1984 | 401.33 | 24.97 % |
| 1985 | 465.08 | 15.88 % |
| 1986 | 516.63 | 11.08 % |
| 1987 | 522.20 | 1.08 % |
| 1988 | 556.87 | 6.64 % |
| 1989 | 594.51 | 6.76 % |
| 1990 | 598.07 | 0.60 % |
| 1991 | 761.26 | 27.29 % |
| 1992 | 969.81 | 27.40 % |
| 1993 | 1,027.45 | 5.94 % |
| 1994 | 996.68 | -2.99 % |
| 1995 | 1,021.20 | 2.46 % |
| 1996 | 1,082.98 | 6.05 % |
| 1997 | 1,093.59 | 0.98 % |
| 1998 | 1,079.56 | -1.28 % |
| 1999 | 1,098.91 | 1.79 % |
| 2000 | 1,116.47 | 1.60 % |
| 2001 | 1,151.89 | 3.17 % |
| 2002 | 1,174.71 | 1.98 % |
| 2003 | 1,189.57 | 1.26 % |
| 2004 | 1,203.45 | 1.17 % |
| 2005 | 1,193.14 | -0.86 % |
| 2006 | 1,195.82 | 0.22 % |
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