|
| year | consumption | change |
| 1980 | 17.40 | NA |
| 1981 | 16.80 | -3.45 % |
| 1982 | 17.30 | 2.98 % |
| 1983 | 16.40 | -5.20 % |
| 1984 | 19.50 | 18.90 % |
| 1985 | 19.20 | -1.54 % |
| 1986 | 19.63 | 2.24 % |
| 1987 | 19.22 | -2.08 % |
| 1988 | 16.32 | -15.08 % |
| 1989 | 17.01 | 4.18 % |
| 1990 | 16.90 | -0.61 % |
| 1991 | 15.66 | -7.36 % |
| 1992 | 19.09 | 21.94 % |
| 1993 | 19.45 | 1.87 % |
| 1994 | 23.48 | 20.72 % |
| 1995 | 25.26 | 7.58 % |
| 1996 | 25.19 | -0.25 % |
| 1997 | 23.50 | -6.74 % |
| 1998 | 25.17 | 7.13 % |
| 1999 | 27.78 | 10.34 % |
| 2000 | 29.55 | 6.39 % |
| 2001 | 29.44 | -0.36 % |
| 2002 | 30.05 | 2.07 % |
| 2003 | 30.32 | 0.89 % |
| 2004 | 33.85 | 11.63 % |
| 2005 | 36.18 | 6.90 % |
| 2006 | 37.15 | 2.68 % |
| 2007 | 37.68 | 1.42 % |
| 2008 | 26.07 | -30.82 % |
| 2009 | 36.16 | 38.72 % |
| 2010 | 36.65 | 1.35 % |
| 2011 | 43.00 | 17.33 % |
|
|