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| year | consumption | change |
| 1986 | 6.20 | NA |
| 1987 | 4.50 | -27.42% |
| 1988 | 4.00 | -11.11% |
| 1989 | 3.70 | -7.50% |
| 1990 | 4.50 | 21.62% |
| 1991 | 3.30 | -26.67% |
| 1992 | 6.60 | 100.00% |
| 1993 | 4.00 | -39.39% |
| 1994 | 6.30 | 57.50% |
| 1995 | 6.70 | 6.35% |
| 1996 | 6.90 | 2.99% |
| 1997 | 6.90 | 0.00% |
| 1998 | 8.30 | 20.29% |
| 1999 | 9.50 | 14.46% |
| 2000 | 11.00 | 15.79% |
| 2001 | 11.00 | 0.00% |
| 2002 | 12.00 | 9.09% |
| 2003 | 11.00 | -8.33% |
| 2004 | 12.00 | 9.09% |
| 2005 | 13.00 | 8.33% |
| 2006 | 14.00 | 7.69% |
| 2007 | 12.00 | -14.29% |
| 2008 | 5.30 | -55.83% |
| 2009 | 13.00 | 145.28% |
| 2010 | 14.00 | 7.69% |
| 2011 | 15.00 | 7.14% |
| 2012 | 17.00 | 13.33% |
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