|
| year | consumption | change |
| 1980 | 11.00 | NA |
| 1981 | 12.00 | 9.09 % |
| 1982 | 15.90 | 32.50 % |
| 1983 | 18.70 | 17.61 % |
| 1984 | 23.00 | 22.99 % |
| 1985 | 28.00 | 21.74 % |
| 1986 | 38.00 | 35.71 % |
| 1987 | 40.20 | 5.79 % |
| 1988 | 36.73 | -8.64 % |
| 1989 | 38.49 | 4.80 % |
| 1990 | 38.00 | -1.27 % |
| 1991 | 36.41 | -4.19 % |
| 1992 | 35.85 | -1.53 % |
| 1993 | 38.85 | 8.36 % |
| 1994 | 50.50 | 30.00 % |
| 1995 | 57.92 | 14.69 % |
| 1996 | 56.50 | -2.44 % |
| 1997 | 53.33 | -5.63 % |
| 1998 | 62.15 | 16.56 % |
| 1999 | 57.56 | -7.39 % |
| 2000 | 65.69 | 14.11 % |
| 2001 | 69.22 | 5.38 % |
| 2002 | 77.69 | 12.24 % |
| 2003 | 88.64 | 14.09 % |
| 2004 | 94.29 | 6.37 % |
| 2005 | 146.20 | 55.06 % |
| 2006 | 127.84 | -12.56 % |
| 2007 | 145.50 | 13.81 % |
| 2008 | 135.96 | -6.55 % |
| 2009 | 114.77 | -15.58 % |
| 2010 | 114.42 | -0.31 % |
| 2011 | 117.95 | 3.09 % |
|
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