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| year | consumption | change |
| 1986 | 9.20 | NA |
| 1987 | 9.70 | 5.43% |
| 1988 | 11.00 | 13.40% |
| 1989 | 13.00 | 18.18% |
| 1990 | 12.00 | -7.69% |
| 1991 | 13.00 | 8.33% |
| 1992 | 14.00 | 7.69% |
| 1993 | 15.00 | 7.14% |
| 1994 | 16.00 | 6.67% |
| 1995 | 15.00 | -6.25% |
| 1996 | 15.00 | 0.00% |
| 1997 | 17.00 | 13.33% |
| 1998 | 18.00 | 5.88% |
| 1999 | 19.00 | 5.56% |
| 2000 | 18.00 | -5.26% |
| 2001 | 20.00 | 11.11% |
| 2002 | 20.00 | 0.00% |
| 2003 | 19.00 | -5.00% |
| 2004 | 19.00 | 0.00% |
| 2005 | 21.00 | 10.53% |
| 2006 | 26.00 | 23.81% |
| 2007 | 26.00 | 0.00% |
| 2008 | 27.00 | 3.85% |
| 2009 | 25.00 | -7.41% |
| 2010 | 23.00 | -8.00% |
| 2011 | 23.00 | 0.00% |
| 2012 | 19.00 | -17.39% |
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