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| year | consumption | change |
| 1986 | 2.90 | NA |
| 1987 | 3.20 | 10.34% |
| 1988 | 3.90 | 21.88% |
| 1989 | 3.90 | 0.00% |
| 1990 | 4.20 | 7.69% |
| 1991 | 3.50 | -16.67% |
| 1992 | 3.80 | 8.57% |
| 1993 | 4.00 | 5.26% |
| 1994 | 4.20 | 5.00% |
| 1995 | 3.80 | -9.52% |
| 1996 | 4.70 | 23.68% |
| 1997 | 4.50 | -4.26% |
| 1998 | 4.40 | -2.22% |
| 1999 | 4.70 | 6.82% |
| 2000 | 5.10 | 8.51% |
| 2001 | 5.40 | 5.88% |
| 2002 | 6.50 | 20.37% |
| 2003 | 7.70 | 18.46% |
| 2004 | 8.90 | 15.58% |
| 2005 | 9.70 | 8.99% |
| 2006 | 11.00 | 13.40% |
| 2007 | 12.00 | 9.09% |
| 2008 | 10.00 | -16.67% |
| 2009 | 11.00 | 10.00% |
| 2010 | 14.00 | 27.27% |
| 2011 | 17.00 | 21.43% |
| 2012 | 18.00 | 5.88% |
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