|
| year | consumption | change |
| 1980 | 2.10 | NA |
| 1981 | 2.10 | 0.00 % |
| 1982 | .90 | -57.14 % |
| 1983 | .90 | 0.00 % |
| 1984 | 1.10 | 22.22 % |
| 1985 | 1.09 | -0.96 % |
| 1986 | .41 | -62.43 % |
| 1987 | .45 | 9.68 % |
| 1988 | .65 | 44.58 % |
| 1989 | .69 | 6.57 % |
| 1990 | .73 | 5.91 % |
| 1991 | .75 | 2.79 % |
| 1992 | .79 | 5.14 % |
| 1993 | .79 | 0.27 % |
| 1994 | .86 | 8.19 % |
| 1995 | .84 | -2.73 % |
| 1996 | .89 | 6.32 % |
| 1997 | .89 | 0.27 % |
| 1998 | .89 | 0.00 % |
| 1999 | .89 | 0.00 % |
| 2000 | 1.50 | 68.91 % |
| 2001 | 1.05 | -30.32 % |
| 2002 | 1.12 | 7.21 % |
| 2003 | 1.12 | 0.00 % |
| 2004 | 2.08 | 85.07 % |
| 2005 | 1.80 | -13.35 % |
| 2006 | 1.98 | 10.09 % |
| 2007 | 2.34 | 17.73 % |
| 2008 | 2.41 | 3.07 % |
| 2009 | 2.65 | 9.92 % |
| 2010 | 2.65 | 0.00 % |
| 2011 | | NA |
|
|