|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 10.64 | NA |
| 1987 | 11.53 | 8.43 % |
| 1988 | 11.76 | 1.94 % |
| 1989 | 13.69 | 16.43 % |
| 1990 | 13.69 | -0.01 % |
| 1991 | 14.27 | 4.21 % |
| 1992 | 16.17 | 13.32 % |
| 1993 | 16.57 | 2.50 % |
| 1994 | 17.62 | 6.35 % |
| 1995 | 13.78 | -21.78 % |
| 1996 | 20.69 | 50.12 % |
| 1997 | 21.89 | 5.80 % |
| 1998 | 17.34 | -20.81 % |
| 1999 | 20.95 | 20.83 % |
| 2000 | 24.63 | 17.60 % |
| 2001 | 23.80 | -3.36 % |
| 2002 | 24.19 | 1.64 % |
| 2003 | 21.03 | -13.07 % |
| 2004 | 19.04 | -9.47 % |
| 2005 | 20.66 | 8.48 % |
| 2006 | 21.83 | 5.67 % |
| 2007 | 22.06 | 1.05 % |
| 2008 | 22.06 | 0.00 % |
| 2009 | 21.20 | -3.87 % |
| 2010 | 18.92 | -10.78 % |
|
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