|
| year | consumption | change |
| 1980 | 53.00 | NA |
| 1981 | 46.30 | -12.64 % |
| 1982 | 38.80 | -16.20 % |
| 1983 | 41.00 | 5.67 % |
| 1984 | 35.00 | -14.63 % |
| 1985 | 31.49 | -10.04 % |
| 1986 | 30.83 | -2.07 % |
| 1987 | 33.05 | 7.20 % |
| 1988 | 38.00 | 14.96 % |
| 1989 | 43.11 | 13.43 % |
| 1990 | 45.69 | 6.00 % |
| 1991 | 47.19 | 3.27 % |
| 1992 | 51.00 | 8.09 % |
| 1993 | 52.10 | 2.16 % |
| 1994 | 54.55 | 4.69 % |
| 1995 | 59.73 | 9.50 % |
| 1996 | 62.06 | 3.91 % |
| 1997 | 66.06 | 6.44 % |
| 1998 | 66.73 | 1.03 % |
| 1999 | 68.59 | 2.77 % |
| 2000 | 65.64 | -4.29 % |
| 2001 | 66.20 | 0.85 % |
| 2002 | 67.78 | 2.37 % |
| 2003 | 70.43 | 3.92 % |
| 2004 | 71.33 | 1.27 % |
| 2005 | 68.97 | -3.31 % |
| 2006 | 77.93 | 12.98 % |
| 2007 | 82.45 | 5.80 % |
| 2008 | 80.35 | -2.55 % |
| 2009 | 58.05 | -27.75 % |
| 2010 | 57.61 | -0.75 % |
| 2011 | 80.00 | 38.86 % |
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