|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | 2.48 | NA |
| 1986 | 3.74 | 51.08 % |
| 1987 | 4.07 | 8.86 % |
| 1988 | 3.96 | -2.65 % |
| 1989 | 4.12 | 3.80 % |
| 1990 | 4.00 | -2.82 % |
| 1991 | 5.17 | 29.24 % |
| 1992 | 5.78 | 11.86 % |
| 1993 | 5.99 | 3.66 % |
| 1994 | 6.83 | 14.04 % |
| 1995 | 7.26 | 6.20 % |
| 1996 | 9.05 | 24.70 % |
| 1997 | 11.09 | 22.57 % |
| 1998 | 14.33 | 29.15 % |
| 1999 | 15.40 | 7.47 % |
| 2000 | 14.90 | -3.21 % |
| 2001 | 15.26 | 2.38 % |
| 2002 | 15.51 | 1.64 % |
| 2003 | 15.67 | 1.06 % |
| 2004 | 16.15 | 3.07 % |
| 2005 | 16.72 | 3.50 % |
| 2006 | 16.92 | 1.20 % |
| 2007 | 16.70 | -1.29 % |
| 2008 | 17.25 | 3.27 % |
| 2009 | 19.99 | 15.88 % |
| 2010 | 21.94 | 9.77 % |
| 2011 | 19.00 | -13.40 % |
|
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