|
| year | consumption | change |
| 1980 | 19.60 | NA |
| 1981 | 17.00 | -13.27 % |
| 1982 | 18.00 | 5.88 % |
| 1983 | 20.00 | 11.11 % |
| 1984 | 20.00 | 0.00 % |
| 1985 | 21.30 | 6.50 % |
| 1986 | 22.32 | 4.78 % |
| 1987 | 24.19 | 8.38 % |
| 1988 | 24.60 | 1.70 % |
| 1989 | 29.96 | 21.76 % |
| 1990 | 31.79 | 6.12 % |
| 1991 | 31.89 | 0.33 % |
| 1992 | 37.88 | 18.76 % |
| 1993 | 38.00 | 0.32 % |
| 1994 | 43.04 | 13.27 % |
| 1995 | 43.06 | 0.04 % |
| 1996 | 42.26 | -1.86 % |
| 1997 | 42.75 | 1.16 % |
| 1998 | 46.20 | 8.07 % |
| 1999 | 48.58 | 5.17 % |
| 2000 | 47.50 | -2.24 % |
| 2001 | 51.63 | 8.70 % |
| 2002 | 50.88 | -1.44 % |
| 2003 | 51.60 | 1.40 % |
| 2004 | 54.54 | 5.71 % |
| 2005 | 55.51 | 1.77 % |
| 2006 | 58.10 | 4.68 % |
| 2007 | 58.10 | -0.01 % |
| 2008 | 60.28 | 3.76 % |
| 2009 | 57.85 | -4.04 % |
| 2010 | 55.98 | -3.24 % |
| 2011 | 65.00 | 16.12 % |
|
|