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| year | consumption | change |
| 1980 | .29 | NA |
| 1981 | .28 | -3.45 % |
| 1982 | .25 | -10.71 % |
| 1983 | .21 | -16.00 % |
| 1984 | .22 | 4.76 % |
| 1985 | .30 | 36.36 % |
| 1986 | .45 | 50.00 % |
| 1987 | .51 | 13.33 % |
| 1988 | .57 | 11.76 % |
| 1989 | .62 | 8.77 % |
| 1990 | .70 | 12.90 % |
| 1991 | .78 | 11.43 % |
| 1992 | .83 | 6.41 % |
| 1993 | .84 | 1.20 % |
| 1994 | .85 | 1.19 % |
| 1995 | 1.00 | 17.65 % |
| 1996 | 1.01 | 1.00 % |
| 1997 | .86 | -14.85 % |
| 1998 | .96 | 11.63 % |
| 1999 | 1.15 | 19.79 % |
| 2000 | 1.28 | 11.30 % |
| 2001 | 1.54 | 20.31 % |
| 2002 | 1.63 | 5.84 % |
| 2003 | 1.63 | 0.00 % |
| 2004 | 1.99 | 22.09 % |
| 2005 | 2.36 | 18.59 % |
| 2006 | 3.30 | 39.83 % |
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