|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 6.95 | NA |
| 1987 | 8.38 | 20.58 % |
| 1988 | 9.69 | 15.66 % |
| 1989 | 11.75 | 21.29 % |
| 1990 | 12.89 | 9.68 % |
| 1991 | 13.26 | 2.89 % |
| 1992 | 15.15 | 14.25 % |
| 1993 | 17.28 | 14.01 % |
| 1994 | 21.80 | 26.19 % |
| 1995 | 21.03 | -3.56 % |
| 1996 | 40.39 | 92.10 % |
| 1997 | 26.35 | -34.76 % |
| 1998 | 30.50 | 15.76 % |
| 1999 | 34.11 | 11.82 % |
| 2000 | 33.68 | -1.26 % |
| 2001 | 32.79 | -2.65 % |
| 2002 | 33.88 | 3.34 % |
| 2003 | 30.38 | -10.34 % |
| 2004 | 32.11 | 5.70 % |
| 2005 | 31.41 | -2.17 % |
| 2006 | 30.87 | -1.74 % |
| 2007 | 31.62 | 2.44 % |
| 2008 | 32.39 | 2.44 % |
| 2009 | 34.75 | 7.27 % |
| 2010 | 35.01 | 0.76 % |
|
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