|
| year | consumption | change |
| 1980 | | NA |
| 1981 | 1.90 | NA |
| 1982 | 1.90 | 0.00 % |
| 1983 | 1.90 | 0.00 % |
| 1984 | .90 | -52.63 % |
| 1985 | 1.05 | 17.20 % |
| 1986 | 1.94 | 83.96 % |
| 1987 | 1.70 | -12.39 % |
| 1988 | 1.12 | -33.97 % |
| 1989 | 1.15 | 2.18 % |
| 1990 | 2.37 | 106.58 % |
| 1991 | 2.23 | -5.68 % |
| 1992 | 2.25 | 0.58 % |
| 1993 | 1.15 | -49.04 % |
| 1994 | 1.19 | 3.68 % |
| 1995 | 1.18 | -0.27 % |
| 1996 | 1.22 | 3.12 % |
| 1997 | 1.23 | 0.69 % |
| 1998 | 1.23 | 0.00 % |
| 1999 | 1.23 | 0.00 % |
| 2000 | 1.34 | 9.10 % |
| 2001 | 1.37 | 2.02 % |
| 2002 | 1.41 | 3.17 % |
| 2003 | 1.41 | 0.00 % |
| 2004 | 1.32 | -6.78 % |
| 2005 | 1.45 | 10.23 % |
| 2006 | 1.57 | 8.25 % |
| 2007 | 1.84 | 16.91 % |
| 2008 | 1.75 | -4.52 % |
| 2009 | 1.75 | 0.00 % |
| 2010 | 1.75 | 0.00 % |
| 2011 | | NA |
|
|