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| year | consumption | change |
| 1986 | 17.00 | NA |
| 1987 | 19.00 | 11.76% |
| 1988 | 22.00 | 15.79% |
| 1989 | 25.00 | 13.64% |
| 1990 | 27.00 | 8.00% |
| 1991 | 30.00 | 11.11% |
| 1992 | 32.00 | 6.67% |
| 1993 | 32.00 | 0.00% |
| 1994 | 29.00 | -9.38% |
| 1995 | 35.00 | 20.69% |
| 1996 | 31.00 | -11.43% |
| 1997 | 29.00 | -6.45% |
| 1998 | 36.00 | 24.14% |
| 1999 | 36.00 | 0.00% |
| 2000 | 40.00 | 11.11% |
| 2001 | 41.00 | 2.50% |
| 2002 | 39.00 | -4.88% |
| 2003 | 40.00 | 2.56% |
| 2004 | 39.00 | -2.50% |
| 2005 | 36.00 | -7.69% |
| 2006 | 40.00 | 11.11% |
| 2007 | 41.00 | 2.50% |
| 2008 | 48.00 | 17.07% |
| 2009 | 29.00 | -39.58% |
| 2010 | 22.00 | -24.14% |
| 2011 | 24.00 | 9.09% |
| 2012 | 23.00 | -4.17% |
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