|
| year | consumption | change |
| 1980 | .80 | NA |
| 1981 | .63 | -21.25 % |
| 1982 | .76 | 20.63 % |
| 1983 | .70 | -7.89 % |
| 1984 | .70 | 0.00 % |
| 1985 | .88 | 25.94 % |
| 1986 | .88 | 0.13 % |
| 1987 | .98 | 11.01 % |
| 1988 | 1.20 | 22.30 % |
| 1989 | 1.20 | 0.27 % |
| 1990 | 1.20 | 0.00 % |
| 1991 | 1.20 | 0.00 % |
| 1992 | 1.24 | 3.36 % |
| 1993 | 1.22 | -1.61 % |
| 1994 | 1.39 | 13.60 % |
| 1995 | 1.41 | 1.47 % |
| 1996 | 1.40 | -0.27 % |
| 1997 | 1.47 | 4.85 % |
| 1998 | 1.47 | 0.00 % |
| 1999 | 1.47 | 0.00 % |
| 2000 | 2.33 | 58.05 % |
| 2001 | 2.44 | 4.66 % |
| 2002 | 2.49 | 2.28 % |
| 2003 | 2.74 | 9.83 % |
| 2004 | 2.68 | -2.16 % |
| 2005 | 2.63 | -1.75 % |
| 2006 | 2.75 | 4.40 % |
| 2007 | 2.85 | 3.78 % |
| 2008 | 2.98 | 4.51 % |
| 2009 | 2.91 | -2.20 % |
| 2010 | 2.91 | 0.00 % |
| 2011 | | NA |
|
|