|
| year | consumption | change |
| 1980 | 39.41 | NA |
| 1981 | 46.93 | 19.09 % |
| 1982 | 79.85 | 70.13 % |
| 1983 | 84.37 | 5.66 % |
| 1984 | 105.38 | 24.91 % |
| 1985 | 133.91 | 27.08 % |
| 1986 | 157.15 | 17.35 % |
| 1987 | 151.18 | -3.80 % |
| 1988 | 164.53 | 8.83 % |
| 1989 | 168.06 | 2.15 % |
| 1990 | 169.00 | 0.56 % |
| 1991 | 182.00 | 7.69 % |
| 1992 | 195.01 | 7.15 % |
| 1993 | 175.16 | -10.18 % |
| 1994 | 174.77 | -0.22 % |
| 1995 | 166.02 | -5.01 % |
| 1996 | 186.32 | 12.23 % |
| 1997 | 198.79 | 6.69 % |
| 1998 | 174.99 | -11.97 % |
| 1999 | 200.31 | 14.47 % |
| 2000 | 212.35 | 6.01 % |
| 2001 | 227.85 | 7.30 % |
| 2002 | 212.31 | -6.82 % |
| 2003 | 164.67 | -22.44 % |
| 2004 | 147.33 | -10.53 % |
| 2005 | 139.99 | -4.99 % |
| 2006 | 148.68 | 6.21 % |
| 2007 | 152.95 | 2.87 % |
| 2008 | 146.49 | -4.23 % |
| 2009 | 150.02 | 2.41 % |
| 2010 | 160.22 | 6.80 % |
| 2011 | 152.95 | -4.54 % |
|
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