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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 0.00% |
| 1982 | .04 | 13.51% |
| 1983 | .04 | -9.52% |
| 1984 | .04 | 2.63% |
| 1985 | .04 | 2.56% |
| 1986 | .04 | 7.50% |
| 1987 | .04 | 2.33% |
| 1988 | .04 | 0.00% |
| 1989 | .04 | 9.09% |
| 1990 | .04 | 0.00% |
| 1991 | .04 | 0.00% |
| 1992 | .05 | 20.83% |
| 1993 | .05 | 0.00% |
| 1994 | .06 | 6.90% |
| 1995 | .06 | 6.45% |
| 1996 | .07 | 12.12% |
| 1997 | .07 | 4.05% |
| 1998 | .08 | 14.29% |
| 1999 | .09 | 7.95% |
| 2000 | .08 | -7.37% |
| 2001 | .10 | 19.32% |
| 2002 | .10 | 2.41% |
| 2003 | .10 | 0.00% |
| 2004 | .09 | -5.14% |
| 2005 | .10 | 2.94% |
| 2006 | .10 | 2.41% |
| 2007 | .10 | 0.00% |
| 2008 | .10 | 0.00% |
| 2009 | .10 | 0.00% |
| 2010 | .10 | 0.00% |
| 2011 | .10 | 0.00% |
| 2012 | .10 | 0.00% |
| 2013 | .10 | 0.00% |
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