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| year | consumption | change |
| 1986 | 2.40 | NA |
| 1987 | 3.80 | 58.33% |
| 1988 | 3.70 | -2.63% |
| 1989 | 4.10 | 10.81% |
| 1990 | 4.50 | 9.76% |
| 1991 | 5.60 | 24.44% |
| 1992 | 4.20 | -25.00% |
| 1993 | 5.90 | 40.48% |
| 1994 | 9.60 | 62.71% |
| 1995 | 7.00 | -27.08% |
| 1996 | 11.00 | 57.14% |
| 1997 | 14.00 | 27.27% |
| 1998 | 14.00 | 0.00% |
| 1999 | 17.00 | 21.43% |
| 2000 | 20.00 | 17.65% |
| 2001 | 17.00 | -15.00% |
| 2002 | 17.00 | 0.00% |
| 2003 | 16.00 | -5.88% |
| 2004 | 19.00 | 18.75% |
| 2005 | 21.00 | 10.53% |
| 2006 | 23.00 | 9.52% |
| 2007 | 26.00 | 13.04% |
| 2008 | 34.00 | 30.77% |
| 2009 | 27.00 | -20.59% |
| 2010 | 26.00 | -3.70% |
| 2011 | 24.00 | -7.69% |
| 2012 | 23.00 | -4.17% |
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