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| year | consumption | change |
| 1986 | 12.00 | NA |
| 1987 | 14.00 | 16.67% |
| 1988 | 13.00 | -7.14% |
| 1989 | 12.00 | -7.69% |
| 1990 | 11.00 | -8.33% |
| 1991 | 13.00 | 18.18% |
| 1992 | 13.00 | 0.00% |
| 1993 | 16.00 | 23.08% |
| 1994 | 18.00 | 12.50% |
| 1995 | 20.00 | 11.11% |
| 1996 | 21.00 | 5.00% |
| 1997 | 29.00 | 38.10% |
| 1998 | 26.00 | -10.34% |
| 1999 | 30.00 | 15.38% |
| 2000 | 36.00 | 20.00% |
| 2001 | 35.00 | -2.78% |
| 2002 | 37.00 | 5.71% |
| 2003 | 36.00 | -2.70% |
| 2004 | 37.00 | 2.78% |
| 2005 | 35.00 | -5.41% |
| 2006 | 31.00 | -11.43% |
| 2007 | 36.00 | 16.13% |
| 2008 | 32.00 | -11.11% |
| 2009 | 30.00 | -6.25% |
| 2010 | 37.00 | 23.33% |
| 2011 | 41.00 | 10.81% |
| 2012 | 40.00 | -2.44% |
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