|
| year | consumption | change |
| 1980 | .42 | NA |
| 1981 | .44 | 4.89 % |
| 1982 | .46 | 3.81 % |
| 1983 | .51 | 12.83 % |
| 1984 | .61 | 19.45 % |
| 1985 | .70 | 13.89 % |
| 1986 | .75 | 7.23 % |
| 1987 | .75 | 0.52 % |
| 1988 | .80 | 6.09 % |
| 1989 | .87 | 8.38 % |
| 1990 | .98 | 13.04 % |
| 1991 | 1.09 | 10.94 % |
| 1992 | 1.14 | 4.61 % |
| 1993 | 1.17 | 2.53 % |
| 1994 | 1.43 | 22.42 % |
| 1995 | 1.47 | 2.97 % |
| 1996 | 1.64 | 11.66 % |
| 1997 | 1.67 | 1.78 % |
| 1998 | 1.69 | 1.09 % |
| 1999 | 1.74 | 3.23 % |
| 2000 | 1.98 | 13.48 % |
| 2001 | 2.11 | 6.56 % |
| 2002 | 2.19 | 4.01 % |
| 2003 | 2.27 | 3.48 % |
| 2004 | 2.26 | -0.33 % |
| 2005 | 2.29 | 1.26 % |
| 2006 | 2.37 | 3.31 % |
| 2007 | 2.60 | 9.84 % |
| 2008 | 2.68 | 3.03 % |
| 2009 | 2.78 | 3.98 % |
| 2010 | 2.99 | 7.38 % |
|
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