|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 56.95 | NA |
| 1993 | 39.93 | -29.89 % |
| 1994 | 22.36 | -43.99 % |
| 1995 | 22.11 | -1.12 % |
| 1996 | 19.62 | -11.25 % |
| 1997 | 18.42 | -6.12 % |
| 1998 | 15.35 | -16.70 % |
| 1999 | 9.79 | -36.23 % |
| 2000 | 9.58 | -2.09 % |
| 2001 | 10.56 | 10.15 % |
| 2002 | 11.98 | 13.54 % |
| 2003 | 12.91 | 7.71 % |
| 2004 | 14.30 | 10.74 % |
| 2005 | 14.62 | 2.26 % |
| 2006 | 14.53 | -0.60 % |
| 2007 | 15.56 | 7.07 % |
| 2008 | 15.56 | 0.02 % |
| 2009 | 14.43 | -7.29 % |
| 2010 | 16.97 | 17.58 % |
| 2011 | 22.00 | 29.68 % |
|
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