|
| year | consumption | change |
| 1980 | .52 | NA |
| 1981 | .48 | -7.84 % |
| 1982 | .46 | -4.25 % |
| 1983 | .55 | 19.12 % |
| 1984 | .54 | -2.29 % |
| 1985 | .57 | 5.27 % |
| 1986 | .62 | 9.95 % |
| 1987 | .64 | 2.62 % |
| 1988 | .77 | 20.06 % |
| 1989 | .83 | 7.52 % |
| 1990 | .92 | 11.21 % |
| 1991 | .60 | -34.61 % |
| 1992 | .84 | 39.79 % |
| 1993 | .84 | 0.69 % |
| 1994 | 1.10 | 30.52 % |
| 1995 | 1.13 | 2.55 % |
| 1996 | 1.12 | -0.52 % |
| 1997 | 1.04 | -7.42 % |
| 1998 | 1.06 | 1.42 % |
| 1999 | 1.07 | 1.67 % |
| 2000 | 1.08 | 0.97 % |
| 2001 | 1.13 | 4.60 % |
| 2002 | 1.14 | 0.90 % |
| 2003 | 1.01 | -11.54 % |
| 2004 | 1.13 | 11.15 % |
| 2005 | 1.24 | 10.11 % |
| 2006 | 1.23 | -1.00 % |
| 2007 | 1.31 | 6.74 % |
| 2008 | 1.34 | 2.38 % |
| 2009 | 1.46 | 8.74 % |
| 2010 | 1.50 | 2.93 % |
|
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