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| year | consumption | change |
| 1980 | .04 | NA |
| 1981 | .04 | 9.09% |
| 1982 | .05 | 2.08% |
| 1983 | .04 | -2.04% |
| 1984 | .05 | 2.08% |
| 1985 | .05 | 4.08% |
| 1986 | .06 | 27.45% |
| 1987 | .07 | 21.54% |
| 1988 | .07 | -3.80% |
| 1989 | .07 | 1.32% |
| 1990 | .08 | 10.39% |
| 1991 | .08 | -3.53% |
| 1992 | .07 | -3.66% |
| 1993 | .08 | 2.53% |
| 1994 | .07 | -1.23% |
| 1995 | .08 | 5.00% |
| 1996 | .08 | 1.19% |
| 1997 | .08 | 0.00% |
| 1998 | .08 | 1.18% |
| 1999 | .08 | 0.00% |
| 2000 | .08 | 0.00% |
| 2001 | .09 | 9.30% |
| 2002 | .09 | 7.45% |
| 2003 | .10 | 6.46% |
| 2004 | .10 | 0.00% |
| 2005 | .10 | 0.00% |
| 2006 | .10 | 0.00% |
| 2007 | .10 | 0.00% |
| 2008 | .10 | 0.00% |
| 2009 | .20 | 100.00% |
| 2010 | .20 | 0.00% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
| 2013 | .20 | 0.00% |
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