|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 27.00 | NA |
| 1987 | 28.00 | 3.70 % |
| 1988 | 28.60 | 2.14 % |
| 1989 | 30.10 | 5.24 % |
| 1990 | 20.00 | -33.55 % |
| 1991 | 24.00 | 20.00 % |
| 1992 | 27.80 | 15.83 % |
| 1993 | 29.21 | 5.08 % |
| 1994 | 34.95 | 19.63 % |
| 1995 | 35.47 | 1.50 % |
| 1996 | 36.41 | 2.65 % |
| 1997 | 39.59 | 8.73 % |
| 1998 | 41.65 | 5.19 % |
| 1999 | 39.42 | -5.33 % |
| 2000 | 39.00 | -1.08 % |
| 2001 | 44.52 | 14.15 % |
| 2002 | 40.97 | -7.98 % |
| 2003 | 43.98 | 7.36 % |
| 2004 | 17.71 | -59.73 % |
| 2005 | 45.62 | 157.55 % |
| 2006 | 51.76 | 13.47 % |
| 2007 | 53.49 | 3.34 % |
| 2008 | 55.55 | 3.84 % |
| 2009 | 56.88 | 2.40 % |
| 2010 | 58.89 | 3.53 % |
|
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