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| year | consumption | change |
| 1986 | 6.60 | NA |
| 1987 | 6.90 | 4.55% |
| 1988 | 7.10 | 2.90% |
| 1989 | 8.20 | 15.49% |
| 1990 | 8.60 | 4.88% |
| 1991 | 9.60 | 11.63% |
| 1992 | 11.00 | 14.58% |
| 1993 | 11.00 | 0.00% |
| 1994 | 11.00 | 0.00% |
| 1995 | 13.00 | 18.18% |
| 1996 | 14.00 | 7.69% |
| 1997 | 15.00 | 7.14% |
| 1998 | 16.00 | 6.67% |
| 1999 | 15.00 | -6.25% |
| 2000 | 14.00 | -6.67% |
| 2001 | 14.00 | 0.00% |
| 2002 | 13.00 | -7.14% |
| 2003 | 13.00 | 0.00% |
| 2004 | 13.00 | 0.00% |
| 2005 | 13.00 | 0.00% |
| 2006 | 14.00 | 7.69% |
| 2007 | 17.00 | 21.43% |
| 2008 | 12.00 | -29.41% |
| 2009 | 12.00 | 0.00% |
| 2010 | 10.00 | -16.67% |
| 2011 | 12.00 | 20.00% |
| 2012 | 14.00 | 16.67% |
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