|
| year | consumption | change |
| 1980 | 48.00 | NA |
| 1981 | 51.00 | 6.25 % |
| 1982 | 52.00 | 1.96 % |
| 1983 | 57.00 | 9.62 % |
| 1984 | 60.00 | 5.26 % |
| 1985 | 64.46 | 7.44 % |
| 1986 | 67.91 | 5.34 % |
| 1987 | 68.58 | 0.99 % |
| 1988 | 64.70 | -5.65 % |
| 1989 | 63.92 | -1.21 % |
| 1990 | 73.21 | 14.54 % |
| 1991 | 76.48 | 4.46 % |
| 1992 | 73.97 | -3.28 % |
| 1993 | 71.66 | -3.12 % |
| 1994 | 69.65 | -2.80 % |
| 1995 | 63.15 | -9.33 % |
| 1996 | 47.84 | -24.24 % |
| 1997 | 40.41 | -15.54 % |
| 1998 | 35.00 | -13.37 % |
| 1999 | 29.99 | -14.31 % |
| 2000 | 25.38 | -15.39 % |
| 2001 | 22.51 | -11.30 % |
| 2002 | 24.53 | 8.95 % |
| 2003 | 24.52 | -0.02 % |
| 2004 | 24.02 | -2.04 % |
| 2005 | 18.62 | -22.49 % |
| 2006 | 14.25 | -23.47 % |
| 2007 | 16.68 | 17.08 % |
| 2008 | 17.10 | 2.50 % |
| 2009 | 13.34 | -22.00 % |
| 2010 | 12.75 | -4.40 % |
| 2011 | 16.00 | 25.47 % |
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