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| year | consumption | change |
| 1986 | 1.10 | NA |
| 1987 | 1.30 | 18.18% |
| 1988 | 1.20 | -7.69% |
| 1989 | 1.40 | 16.67% |
| 1990 | 1.50 | 7.14% |
| 1991 | 1.70 | 13.33% |
| 1992 | 2.00 | 17.65% |
| 1993 | 2.00 | 0.00% |
| 1994 | 2.30 | 15.00% |
| 1995 | 2.30 | 0.00% |
| 1996 | 3.00 | 30.43% |
| 1997 | 4.00 | 33.33% |
| 1998 | 5.00 | 25.00% |
| 1999 | 5.80 | 16.00% |
| 2000 | 5.30 | -8.62% |
| 2001 | 6.40 | 20.75% |
| 2002 | 6.00 | -6.25% |
| 2003 | 6.30 | 5.00% |
| 2004 | 6.50 | 3.17% |
| 2005 | 6.70 | 3.08% |
| 2006 | 4.90 | -26.87% |
| 2007 | 5.00 | 2.04% |
| 2008 | 5.10 | 2.00% |
| 2009 | .90 | -82.35% |
| 2010 | .80 | -11.11% |
| 2011 | .90 | 12.50% |
| 2012 | .90 | 0.00% |
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