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| year | consumption | change |
| 1986 | 2.20 | NA |
| 1987 | 2.70 | 22.73% |
| 1988 | 3.00 | 11.11% |
| 1989 | 5.00 | 66.67% |
| 1990 | 3.80 | -24.00% |
| 1991 | 2.40 | -36.84% |
| 1992 | 4.30 | 79.17% |
| 1993 | 3.50 | -18.60% |
| 1994 | 5.50 | 57.14% |
| 1995 | 5.20 | -5.45% |
| 1996 | 5.20 | 0.00% |
| 1997 | 2.90 | -44.23% |
| 1998 | 5.20 | 79.31% |
| 1999 | 1.20 | -76.92% |
| 2000 | 1.60 | 33.33% |
| 2001 | 1.10 | -31.25% |
| 2002 | 1.10 | 0.00% |
| 2003 | 1.50 | 36.36% |
| 2004 | 1.40 | -6.67% |
| 2005 | 1.40 | 0.00% |
| 2006 | 2.30 | 64.29% |
| 2007 | .40 | -82.61% |
| 2008 | 1.40 | 250.00% |
| 2009 | .80 | -42.86% |
| 2010 | 1.30 | 62.50% |
| 2011 | 2.20 | 69.23% |
| 2012 | 1.60 | -27.27% |
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