|
| year | consumption | change |
| 1980 | 117.00 | NA |
| 1981 | 105.00 | -10.26 % |
| 1982 | 75.80 | -27.81 % |
| 1983 | 54.00 | -28.76 % |
| 1984 | 63.00 | 16.67 % |
| 1985 | 70.52 | 11.94 % |
| 1986 | 46.79 | -33.66 % |
| 1987 | 54.79 | 17.09 % |
| 1988 | 39.33 | -28.22 % |
| 1989 | 59.98 | 52.52 % |
| 1990 | 54.96 | -8.38 % |
| 1991 | 55.55 | 1.09 % |
| 1992 | 55.37 | -0.34 % |
| 1993 | 53.45 | -3.47 % |
| 1994 | 55.85 | 4.51 % |
| 1995 | 56.57 | 1.27 % |
| 1996 | 56.90 | 0.58 % |
| 1997 | 58.26 | 2.40 % |
| 1998 | 60.30 | 3.49 % |
| 1999 | 145.62 | 141.50 % |
| 2000 | 66.08 | -54.62 % |
| 2001 | 91.70 | 38.77 % |
| 2002 | 93.24 | 1.69 % |
| 2003 | 108.78 | 16.66 % |
| 2004 | 110.90 | 1.95 % |
| 2005 | 108.75 | -1.94 % |
| 2006 | 115.57 | 6.27 % |
| 2007 | 113.14 | -2.11 % |
| 2008 | 108.33 | -4.25 % |
| 2009 | 111.26 | 2.70 % |
| 2010 | 113.51 | 2.03 % |
| 2011 | 138.00 | 21.57 % |
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