|
| 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 | 24.36 | NA |
| 1993 | 30.02 | 23.23 % |
| 1994 | 28.96 | -3.52 % |
| 1995 | 34.61 | 19.51 % |
| 1996 | 44.85 | 29.59 % |
| 1997 | 31.71 | -29.29 % |
| 1998 | 33.51 | 5.68 % |
| 1999 | 34.96 | 4.32 % |
| 2000 | 35.67 | 2.02 % |
| 2001 | 36.73 | 2.97 % |
| 2002 | 34.26 | -6.73 % |
| 2003 | 35.81 | 4.54 % |
| 2004 | 38.25 | 6.80 % |
| 2005 | 39.69 | 3.79 % |
| 2006 | 39.02 | -1.69 % |
| 2007 | 39.66 | 1.63 % |
| 2008 | 38.10 | -3.92 % |
| 2009 | 36.09 | -5.28 % |
| 2010 | 37.43 | 3.72 % |
| 2011 | 32.00 | -14.53 % |
|
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