|
| year | consumption | change |
| 1980 | .36 | NA |
| 1981 | .38 | 5.56 % |
| 1982 | .44 | 15.79 % |
| 1983 | .36 | -18.18 % |
| 1984 | .36 | 0.00 % |
| 1985 | .36 | 0.91 % |
| 1986 | .36 | 0.08 % |
| 1987 | .38 | 5.62 % |
| 1988 | .45 | 16.60 % |
| 1989 | .45 | 0.27 % |
| 1990 | .45 | 0.00 % |
| 1991 | .51 | 13.82 % |
| 1992 | .51 | -0.27 % |
| 1993 | .58 | 13.02 % |
| 1994 | .68 | 18.00 % |
| 1995 | .62 | -8.50 % |
| 1996 | .70 | 12.73 % |
| 1997 | .70 | 0.28 % |
| 1998 | .70 | 0.00 % |
| 1999 | .70 | 0.00 % |
| 2000 | .70 | -0.27 % |
| 2001 | .70 | 0.28 % |
| 2002 | .70 | 0.00 % |
| 2003 | .79 | 12.15 % |
| 2004 | .87 | 10.53 % |
| 2005 | .92 | 5.30 % |
| 2006 | 1.20 | 30.94 % |
| 2007 | 1.70 | 41.37 % |
| 2008 | 1.70 | 0.00 % |
| 2009 | 1.78 | 5.03 % |
| 2010 | 1.78 | 0.00 % |
| 2011 | | NA |
|
|