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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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