|
| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.10 | 0.00 % |
| 1982 | 1.10 | 0.00 % |
| 1983 | 1.10 | 0.00 % |
| 1984 | 1.20 | 9.09 % |
| 1985 | 1.19 | -0.77 % |
| 1986 | 1.11 | -6.80 % |
| 1987 | 1.28 | 15.20 % |
| 1988 | 1.32 | 3.14 % |
| 1989 | 1.30 | -1.28 % |
| 1990 | 1.33 | 1.97 % |
| 1991 | 1.39 | 4.44 % |
| 1992 | 1.38 | -0.27 % |
| 1993 | 1.47 | 6.45 % |
| 1994 | 1.63 | 10.42 % |
| 1995 | 1.52 | -6.74 % |
| 1996 | 1.51 | -0.27 % |
| 1997 | 1.52 | 0.27 % |
| 1998 | 1.60 | 5.83 % |
| 1999 | 1.60 | 0.00 % |
| 2000 | 1.79 | 11.57 % |
| 2001 | 1.92 | 7.13 % |
| 2002 | 1.97 | 2.59 % |
| 2003 | 1.99 | 1.19 % |
| 2004 | 2.01 | 0.90 % |
| 2005 | 2.08 | 3.66 % |
| 2006 | 2.22 | 6.87 % |
| 2007 | 2.77 | 24.32 % |
| 2008 | 2.87 | 3.80 % |
| 2009 | 3.12 | 8.59 % |
| 2010 | 3.39 | 8.83 % |
| 2011 | | NA |
|
|