|
| year | consumption | change |
| 1980 | | NA |
| 1981 | 1.30 | NA |
| 1982 | 1.40 | 7.69 % |
| 1983 | 1.50 | 7.14 % |
| 1984 | 1.40 | -6.67 % |
| 1985 | 1.43 | 2.33 % |
| 1986 | 1.69 | 17.98 % |
| 1987 | 1.52 | -10.30 % |
| 1988 | 1.62 | 6.97 % |
| 1989 | 1.54 | -5.21 % |
| 1990 | 1.67 | 8.49 % |
| 1991 | 1.75 | 4.90 % |
| 1992 | 1.79 | 2.17 % |
| 1993 | 1.84 | 2.70 % |
| 1994 | 1.94 | 5.88 % |
| 1995 | 1.94 | -0.27 % |
| 1996 | 1.96 | 1.05 % |
| 1997 | 2.01 | 2.58 % |
| 1998 | 2.05 | 2.07 % |
| 1999 | 2.05 | 0.00 % |
| 2000 | 2.20 | 7.03 % |
| 2001 | 2.24 | 2.04 % |
| 2002 | 2.33 | 3.97 % |
| 2003 | 2.33 | 0.00 % |
| 2004 | 2.20 | -5.48 % |
| 2005 | 2.10 | -4.80 % |
| 2006 | 2.20 | 5.13 % |
| 2007 | 2.42 | 9.74 % |
| 2008 | 2.48 | 2.62 % |
| 2009 | 2.32 | -6.59 % |
| 2010 | 2.32 | 0.00 % |
| 2011 | | NA |
|
|