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| year | consumption | change |
| 1986 | 2.90 | NA |
| 1987 | 3.00 | 3.45% |
| 1988 | 2.90 | -3.33% |
| 1989 | 3.00 | 3.45% |
| 1990 | 2.70 | -10.00% |
| 1991 | 2.90 | 7.41% |
| 1992 | 3.60 | 24.14% |
| 1993 | 3.70 | 2.78% |
| 1994 | .70 | -81.08% |
| 1995 | 1.00 | 42.86% |
| 1996 | 1.10 | 10.00% |
| 1997 | 1.10 | 0.00% |
| 1998 | 3.10 | 181.82% |
| 1999 | 3.20 | 3.23% |
| 2000 | 3.40 | 6.25% |
| 2001 | 3.00 | -11.76% |
| 2002 | 3.20 | 6.67% |
| 2003 | 2.70 | -15.63% |
| 2004 | 3.00 | 11.11% |
| 2005 | 2.90 | -3.33% |
| 2006 | 3.40 | 17.24% |
| 2007 | 3.30 | -2.94% |
| 2008 | 3.50 | 6.06% |
| 2009 | 3.80 | 8.57% |
| 2010 | 3.60 | -5.26% |
| 2011 | 3.60 | 0.00% |
| 2012 | 3.90 | 8.33% |
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