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| year | consumption | change |
| 1980 | .60 | NA |
| 1981 | .30 | -50.00% |
| 1982 | .30 | 0.00% |
| 1983 | .30 | 0.00% |
| 1984 | .10 | -66.67% |
| 1985 | .20 | 100.00% |
| 1986 | .20 | 0.00% |
| 1987 | .80 | 300.00% |
| 1988 | .70 | -12.50% |
| 1989 | 1.10 | 57.14% |
| 1990 | 1.10 | 0.00% |
| 1991 | 1.20 | 9.09% |
| 1992 | 1.20 | 0.00% |
| 1993 | 1.30 | 8.33% |
| 1994 | 1.20 | -7.69% |
| 1995 | 1.40 | 16.67% |
| 1996 | 1.50 | 7.14% |
| 1997 | 26.00 | 1,633.33% |
| 1998 | 14.00 | -46.15% |
| 1999 | 18.00 | 28.57% |
| 2000 | 21.00 | 16.67% |
| 2001 | 11.00 | -47.62% |
| 2002 | 12.00 | 9.09% |
| 2003 | 13.00 | 8.33% |
| 2004 | 13.00 | 0.00% |
| 2005 | 14.00 | 7.69% |
| 2006 | 14.00 | 0.00% |
| 2007 | 21.00 | 50.00% |
| 2008 | 41.00 | 95.24% |
| 2009 | 41.00 | 0.00% |
| 2010 | 38.00 | -7.32% |
| 2011 | 36.00 | -5.26% |
| 2012 | 37.00 | 2.78% |
| 2013 | 37.00 | 0.00% |
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