|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 19.00 | NA |
| 1987 | 20.49 | 7.85 % |
| 1988 | 22.37 | 9.19 % |
| 1989 | 26.67 | 19.20 % |
| 1990 | 26.20 | -1.76 % |
| 1991 | 29.40 | 12.21 % |
| 1992 | 29.37 | -0.12 % |
| 1993 | 27.17 | -7.46 % |
| 1994 | 25.71 | -5.40 % |
| 1995 | 23.44 | -8.82 % |
| 1996 | 22.51 | -3.95 % |
| 1997 | 18.18 | -19.24 % |
| 1998 | 23.01 | 26.53 % |
| 1999 | 28.46 | 23.73 % |
| 2000 | 29.06 | 2.10 % |
| 2001 | 31.29 | 7.67 % |
| 2002 | 30.47 | -2.61 % |
| 2003 | 29.42 | -3.45 % |
| 2004 | 31.18 | 5.98 % |
| 2005 | 31.95 | 2.45 % |
| 2006 | 38.26 | 19.75 % |
| 2007 | 35.24 | -7.88 % |
| 2008 | 29.96 | -14.99 % |
| 2009 | 20.47 | -31.67 % |
| 2010 | 42.11 | 105.71 % |
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