|
| year | consumption | change |
| 1980 | .60 | NA |
| 1981 | .60 | 0.00 % |
| 1982 | .60 | 0.00 % |
| 1983 | .60 | 0.00 % |
| 1984 | .82 | 36.67 % |
| 1985 | .88 | 7.80 % |
| 1986 | .70 | -20.95 % |
| 1987 | 1.26 | 79.71 % |
| 1988 | 1.40 | 11.50 % |
| 1989 | 1.47 | 4.91 % |
| 1990 | 1.84 | 25.29 % |
| 1991 | 1.88 | 1.98 % |
| 1992 | 1.89 | 0.70 % |
| 1993 | 2.02 | 7.12 % |
| 1994 | 2.06 | 1.98 % |
| 1995 | 2.05 | -0.95 % |
| 1996 | 2.06 | 0.80 % |
| 1997 | 2.07 | 0.27 % |
| 1998 | 2.07 | 0.00 % |
| 1999 | 2.07 | 0.00 % |
| 2000 | 2.30 | 11.13 % |
| 2001 | 2.32 | 1.16 % |
| 2002 | 2.41 | 3.49 % |
| 2003 | 2.47 | 2.67 % |
| 2004 | 2.46 | -0.27 % |
| 2005 | 2.56 | 3.96 % |
| 2006 | 2.55 | -0.59 % |
| 2007 | 2.63 | 3.27 % |
| 2008 | 2.58 | -1.92 % |
| 2009 | 2.66 | 3.25 % |
| 2010 | 2.66 | 0.00 % |
| 2011 | | NA |
|
|