|
| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .17 | 750.00 % |
| 1982 | .21 | 23.53 % |
| 1983 | .19 | -9.52 % |
| 1984 | .18 | -5.26 % |
| 1985 | .23 | 29.50 % |
| 1986 | .23 | -0.06 % |
| 1987 | .27 | 15.36 % |
| 1988 | .27 | -0.27 % |
| 1989 | .27 | 0.27 % |
| 1990 | .63 | 132.58 % |
| 1991 | .63 | 0.00 % |
| 1992 | .64 | 2.99 % |
| 1993 | .65 | 0.27 % |
| 1994 | .74 | 15.00 % |
| 1995 | .86 | 15.79 % |
| 1996 | .93 | 8.50 % |
| 1997 | .91 | -2.02 % |
| 1998 | .96 | 5.30 % |
| 1999 | .96 | 0.00 % |
| 2000 | .98 | 1.85 % |
| 2001 | 1.05 | 6.91 % |
| 2002 | 1.09 | 3.90 % |
| 2003 | 1.13 | 3.82 % |
| 2004 | 1.14 | 0.73 % |
| 2005 | 1.15 | 1.20 % |
| 2006 | 1.17 | 1.41 % |
| 2007 | 1.55 | 32.60 % |
| 2008 | 1.59 | 2.65 % |
| 2009 | 2.00 | 25.53 % |
| 2010 | 2.00 | 0.11 % |
| 2011 | | NA |
|
|