|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | .28 | NA |
| 1987 | .28 | 0.00 % |
| 1988 | .28 | -0.27 % |
| 1989 | .28 | 0.28 % |
| 1990 | .28 | 0.00 % |
| 1991 | .28 | 0.00 % |
| 1992 | .29 | 3.50 % |
| 1993 | .30 | 4.64 % |
| 1994 | .28 | -6.67 % |
| 1995 | .28 | 0.00 % |
| 1996 | .28 | 0.00 % |
| 1997 | .28 | 0.00 % |
| 1998 | .30 | 7.14 % |
| 1999 | .30 | 0.00 % |
| 2000 | .30 | 0.00 % |
| 2001 | .30 | 0.00 % |
| 2002 | .30 | 0.00 % |
| 2003 | .30 | 0.00 % |
| 2004 | .30 | 0.00 % |
| 2005 | .30 | 0.00 % |
| 2006 | .36 | 20.01 % |
| 2007 | .37 | 2.77 % |
| 2008 | .35 | -5.41 % |
| 2009 | .36 | 2.87 % |
| 2010 | | NA |
|
|