|
| year | consumption | change |
| 1980 | 160.00 | NA |
| 1981 | 165.00 | 3.13 % |
| 1982 | 180.00 | 9.09 % |
| 1983 | 192.00 | 6.67 % |
| 1984 | 194.00 | 1.04 % |
| 1985 | 194.00 | 0.00 % |
| 1986 | 192.27 | -0.89 % |
| 1987 | 197.30 | 2.61 % |
| 1988 | 202.50 | 2.64 % |
| 1989 | 220.07 | 8.68 % |
| 1990 | 265.98 | 20.86 % |
| 1991 | 281.53 | 5.85 % |
| 1992 | 301.52 | 7.10 % |
| 1993 | 335.95 | 11.42 % |
| 1994 | 377.51 | 12.37 % |
| 1995 | 399.16 | 5.74 % |
| 1996 | 435.26 | 9.04 % |
| 1997 | 469.34 | 7.83 % |
| 1998 | 449.23 | -4.29 % |
| 1999 | 454.32 | 1.13 % |
| 2000 | 465.02 | 2.36 % |
| 2001 | 475.10 | 2.17 % |
| 2002 | 462.75 | -2.60 % |
| 2003 | 479.86 | 3.70 % |
| 2004 | 508.04 | 5.87 % |
| 2005 | 521.85 | 2.72 % |
| 2006 | 534.41 | 2.41 % |
| 2007 | 544.94 | 1.97 % |
| 2008 | 669.10 | 22.78 % |
| 2009 | 585.09 | -12.56 % |
| 2010 | 598.40 | 2.27 % |
| 2011 | 547.00 | -8.59 % |
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