|
| year | consumption | change |
| 1980 | 972.93 | NA |
| 1981 | 953.40 | -2.01 % |
| 1982 | 861.17 | -9.67 % |
| 1983 | 810.55 | -5.88 % |
| 1984 | 818.58 | 0.99 % |
| 1985 | 791.79 | -3.27 % |
| 1986 | 787.84 | -0.50 % |
| 1987 | 815.12 | 3.46 % |
| 1988 | 801.24 | -1.70 % |
| 1989 | 842.84 | 5.19 % |
| 1990 | 843.02 | 0.02 % |
| 1991 | 859.37 | 1.94 % |
| 1992 | 837.55 | -2.54 % |
| 1993 | 845.79 | 0.98 % |
| 1994 | 896.67 | 6.02 % |
| 1995 | 943.70 | 5.24 % |
| 1996 | 953.74 | 1.06 % |
| 1997 | 1,003.52 | 5.22 % |
| 1998 | 1,042.41 | 3.88 % |
| 1999 | 1,111.14 | 6.59 % |
| 2000 | 1,089.84 | -1.92 % |
| 2001 | 1,167.83 | 7.16 % |
| 2002 | 1,168.35 | 0.04 % |
| 2003 | 1,207.63 | 3.36 % |
| 2004 | 1,258.07 | 4.18 % |
| 2005 | 1,235.29 | -1.81 % |
| 2006 | 1,224.75 | -0.85 % |
| 2007 | 1,213.02 | -0.96 % |
| 2008 | 1,148.23 | -5.34 % |
| 2009 | 1,169.37 | 1.84 % |
| 2010 | 1,188.66 | 1.65 % |
| 2011 | 1,252.00 | 5.33 % |
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