|
| year | consumption | change |
| 1980 | .16 | NA |
| 1981 | .25 | 56.25 % |
| 1982 | .25 | 0.00 % |
| 1983 | .25 | 0.00 % |
| 1984 | .23 | -8.00 % |
| 1985 | .24 | 2.70 % |
| 1986 | .26 | 9.11 % |
| 1987 | .30 | 16.99 % |
| 1988 | .32 | 6.49 % |
| 1989 | .34 | 6.64 % |
| 1990 | .34 | 0.00 % |
| 1991 | .34 | 0.00 % |
| 1992 | .36 | 6.53 % |
| 1993 | .37 | 0.27 % |
| 1994 | .37 | 0.01 % |
| 1995 | .37 | 0.00 % |
| 1996 | .41 | 12.47 % |
| 1997 | .41 | 0.27 % |
| 1998 | .41 | 0.00 % |
| 1999 | .41 | 0.00 % |
| 2000 | .41 | -0.27 % |
| 2001 | .41 | 0.27 % |
| 2002 | .41 | 0.00 % |
| 2003 | .48 | 15.58 % |
| 2004 | .60 | 26.76 % |
| 2005 | .65 | 7.52 % |
| 2006 | .69 | 6.40 % |
| 2007 | .75 | 8.75 % |
| 2008 | .78 | 4.14 % |
| 2009 | .77 | -1.33 % |
| 2010 | .77 | 0.00 % |
| 2011 | | NA |
|
|