|
| year | consumption | change |
| 1980 | .33 | NA |
| 1981 | .38 | 15.15 % |
| 1982 | .42 | 10.53 % |
| 1983 | .40 | -4.76 % |
| 1984 | .42 | 5.00 % |
| 1985 | .43 | 2.26 % |
| 1986 | .47 | 10.05 % |
| 1987 | .51 | 7.19 % |
| 1988 | .54 | 7.34 % |
| 1989 | .57 | 4.03 % |
| 1990 | .89 | 56.89 % |
| 1991 | .89 | 0.00 % |
| 1992 | .91 | 2.47 % |
| 1993 | 1.00 | 9.80 % |
| 1994 | 1.18 | 17.91 % |
| 1995 | 1.10 | -6.70 % |
| 1996 | 1.23 | 12.32 % |
| 1997 | 1.55 | 25.61 % |
| 1998 | 1.39 | -10.55 % |
| 1999 | 1.39 | 0.00 % |
| 2000 | .96 | -31.01 % |
| 2001 | 1.61 | 67.93 % |
| 2002 | 1.74 | 8.62 % |
| 2003 | 1.76 | 0.82 % |
| 2004 | 1.78 | 0.96 % |
| 2005 | 1.82 | 2.49 % |
| 2006 | 1.92 | 5.66 % |
| 2007 | 1.91 | -0.52 % |
| 2008 | 1.98 | 3.30 % |
| 2009 | 2.01 | 1.80 % |
| 2010 | 2.00 | -0.39 % |
| 2011 | | NA |
|
|