|
| year | consumption | change |
| 1980 | .27 | NA |
| 1981 | .25 | -7.41 % |
| 1982 | .27 | 8.00 % |
| 1983 | .27 | 0.00 % |
| 1984 | .25 | -7.41 % |
| 1985 | .29 | 16.83 % |
| 1986 | .29 | 0.12 % |
| 1987 | .32 | 7.99 % |
| 1988 | .38 | 20.57 % |
| 1989 | .56 | 48.04 % |
| 1990 | .59 | 4.32 % |
| 1991 | .56 | -4.15 % |
| 1992 | .60 | 6.96 % |
| 1993 | .56 | -6.51 % |
| 1994 | .89 | 58.68 % |
| 1995 | .94 | 5.23 % |
| 1996 | .94 | -0.27 % |
| 1997 | 1.01 | 7.17 % |
| 1998 | 1.19 | 18.38 % |
| 1999 | 1.19 | 0.00 % |
| 2000 | 1.21 | 1.77 % |
| 2001 | 1.23 | 1.85 % |
| 2002 | 1.31 | 5.89 % |
| 2003 | 1.38 | 5.33 % |
| 2004 | 1.47 | 6.61 % |
| 2005 | 1.46 | -0.50 % |
| 2006 | 1.45 | -0.65 % |
| 2007 | 1.47 | 1.61 % |
| 2008 | 1.47 | 0.00 % |
| 2009 | 1.47 | 0.00 % |
| 2010 | 1.47 | 0.00 % |
| 2011 | | NA |
|
|