|
| year | consumption | change |
| 1984 | 21.85 | NA |
| 1985 | 21.50 | -1.61 % |
| 1986 | 20.91 | -2.73 % |
| 1987 | 19.81 | -5.27 % |
| 1988 | 20.42 | 3.09 % |
| 1989 | 20.82 | 1.98 % |
| 1990 | 23.19 | 11.38 % |
| 1991 | 23.58 | 1.67 % |
| 1992 | 25.93 | 9.96 % |
| 1993 | 26.61 | 2.62 % |
| 1994 | 30.21 | 13.54 % |
| 1995 | 33.56 | 11.08 % |
| 1996 | 34.04 | 1.44 % |
| 1997 | 35.73 | 4.95 % |
| 1998 | 39.32 | 10.06 % |
| 1999 | 40.21 | 2.25 % |
| 2000 | 42.46 | 5.60 % |
| 2001 | 42.74 | 0.66 % |
| 2002 | 46.46 | 8.71 % |
| 2003 | 47.29 | 1.79 % |
| 2004 | 48.04 | 1.57 % |
| 2005 | 50.88 | 5.93 % |
| 2006 | 51.65 | 1.50 % |
| 2007 | 52.95 | 2.53 % |
| 2008 | 53.64 | 1.31 % |
| 2009 | 50.45 | -5.94 % |
| 2010 | 51.24 | 1.55 % |
|
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