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| year | consumption | change |
| 1986 | 2.70 | NA |
| 1987 | 3.10 | 14.81% |
| 1988 | 4.60 | 48.39% |
| 1989 | 4.40 | -4.35% |
| 1990 | 3.20 | -27.27% |
| 1991 | 3.20 | 0.00% |
| 1992 | 3.40 | 6.25% |
| 1993 | 3.80 | 11.76% |
| 1994 | 3.50 | -7.89% |
| 1995 | 4.90 | 40.00% |
| 1996 | 4.00 | -18.37% |
| 1997 | 4.50 | 12.50% |
| 1998 | 4.20 | -6.67% |
| 1999 | 6.60 | 57.14% |
| 2000 | 4.10 | -37.88% |
| 2001 | 4.10 | 0.00% |
| 2002 | 2.70 | -34.15% |
| 2003 | 4.30 | 59.26% |
| 2004 | 3.00 | -30.23% |
| 2005 | 3.10 | 3.33% |
| 2006 | 3.80 | 22.58% |
| 2007 | 3.90 | 2.63% |
| 2008 | 4.90 | 25.64% |
| 2009 | 3.00 | -38.78% |
| 2010 | 3.20 | 6.67% |
| 2011 | 5.00 | 56.25% |
| 2012 | 5.30 | 6.00% |
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