|
| year | consumption | change |
| 1980 | .74 | NA |
| 1981 | .91 | 22.97 % |
| 1982 | .99 | 8.79 % |
| 1983 | 1.41 | 42.42 % |
| 1984 | 1.80 | 27.66 % |
| 1985 | 1.75 | -2.78 % |
| 1986 | 1.94 | 10.86 % |
| 1987 | 1.93 | -0.52 % |
| 1988 | 2.01 | 4.15 % |
| 1989 | 2.20 | 9.45 % |
| 1990 | 1.80 | -18.18 % |
| 1991 | 1.74 | -3.33 % |
| 1992 | 1.98 | 13.79 % |
| 1993 | 2.17 | 9.60 % |
| 1994 | 2.23 | 2.76 % |
| 1995 | 2.40 | 7.62 % |
| 1996 | 2.22 | -7.50 % |
| 1997 | 2.89 | 30.18 % |
| 1998 | 3.20 | 10.73 % |
| 1999 | 3.08 | -3.75 % |
| 2000 | 4.56 | 48.05 % |
| 2001 | 4.28 | -6.14 % |
| 2002 | 4.79 | 11.92 % |
| 2003 | 5.24 | 9.39 % |
| 2004 | 8.41 | 60.50 % |
| 2005 | 8.83 | 4.99 % |
| 2006 | 9.83 | 11.33 % |
|
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