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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .13 | 160.00% |
| 1982 | .17 | 30.77% |
| 1983 | .18 | 5.88% |
| 1984 | .18 | 0.00% |
| 1985 | .18 | 0.00% |
| 1986 | .21 | 16.67% |
| 1987 | .23 | 9.52% |
| 1988 | .25 | 8.70% |
| 1989 | .26 | 4.00% |
| 1990 | .29 | 11.54% |
| 1991 | .27 | -6.90% |
| 1992 | .22 | -18.52% |
| 1993 | .24 | 9.09% |
| 1994 | .25 | 4.17% |
| 1995 | .28 | 12.00% |
| 1996 | .33 | 17.86% |
| 1997 | .36 | 9.09% |
| 1998 | .62 | 72.22% |
| 1999 | 1.08 | 74.19% |
| 2000 | 1.26 | 16.67% |
| 2001 | 1.38 | 9.52% |
| 2002 | 1.36 | -1.45% |
| 2003 | 1.34 | -1.47% |
| 2004 | 1.41 | 5.22% |
| 2005 | 1.58 | 12.06% |
| 2006 | 2.50 | 58.23% |
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