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| year | consumption | change |
| 1986 | 10.00 | NA |
| 1987 | 9.00 | -10.00% |
| 1988 | 10.00 | 11.11% |
| 1989 | 10.00 | 0.00% |
| 1990 | 11.00 | 10.00% |
| 1991 | 10.00 | -9.09% |
| 1992 | 11.00 | 10.00% |
| 1993 | 13.00 | 18.18% |
| 1994 | 15.00 | 15.38% |
| 1995 | 14.00 | -6.67% |
| 1996 | 15.00 | 7.14% |
| 1997 | 17.00 | 13.33% |
| 1998 | 19.00 | 11.76% |
| 1999 | 19.00 | 0.00% |
| 2000 | 18.00 | -5.26% |
| 2001 | 21.00 | 16.67% |
| 2002 | 20.00 | -4.76% |
| 2003 | 22.00 | 10.00% |
| 2004 | 22.00 | 0.00% |
| 2005 | 23.00 | 4.55% |
| 2006 | 24.00 | 4.35% |
| 2007 | 26.00 | 8.33% |
| 2008 | 23.00 | -11.54% |
| 2009 | 26.00 | 13.04% |
| 2010 | 26.00 | 0.00% |
| 2011 | 25.00 | -3.85% |
| 2012 | 26.00 | 4.00% |
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