|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | 15.00 | NA |
| 1991 | 6.90 | -54.02 % |
| 1992 | 7.03 | 1.89 % |
| 1993 | 8.67 | 23.31 % |
| 1994 | 8.37 | -3.38 % |
| 1995 | 8.37 | 0.00 % |
| 1996 | 8.83 | 5.41 % |
| 1997 | 9.37 | 6.19 % |
| 1998 | 10.07 | 7.47 % |
| 1999 | 11.86 | 17.75 % |
| 2000 | 12.63 | 6.48 % |
| 2001 | 15.05 | 19.16 % |
| 2002 | 15.42 | 2.43 % |
| 2003 | 16.64 | 7.90 % |
| 2004 | 17.58 | 5.67 % |
| 2005 | 17.75 | 0.95 % |
| 2006 | 19.12 | 7.73 % |
| 2007 | 20.11 | 5.21 % |
| 2008 | 20.39 | 1.35 % |
| 2009 | 21.99 | 7.87 % |
| 2010 | 20.81 | -5.35 % |
| 2011 | 26.00 | 24.92 % |
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