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| year | consumption | change |
| 1986 | 49.00 | NA |
| 1987 | 50.00 | 2.04 % |
| 1988 | 52.00 | 4.00 % |
| 1989 | 51.00 | -1.92 % |
| 1990 | 49.00 | -3.92 % |
| 1991 | 50.00 | 2.04 % |
| 1992 | 42.00 | -16.00 % |
| 1993 | 35.00 | -16.67 % |
| 1994 | 30.00 | -14.29 % |
| 1995 | 25.00 | -16.67 % |
| 1996 | 33.00 | 32.00 % |
| 1997 | 25.00 | -24.24 % |
| 1998 | 24.00 | -4.00 % |
| 1999 | 22.00 | -8.33 % |
| 2000 | 21.00 | -4.55 % |
| 2001 | 21.00 | 0.00 % |
| 2002 | 21.00 | 0.00 % |
| 2003 | 15.00 | -28.57 % |
| 2004 | 11.00 | -26.67 % |
| 2005 | 6.50 | -40.91 % |
| 2006 | 3.50 | -46.15 % |
| 2007 | 3.00 | -14.29 % |
| 2008 | 2.80 | -6.67 % |
| 2009 | 3.20 | 14.29 % |
| 2010 | 3.20 | 0.00 % |
| 2011 | 2.90 | -9.38 % |
| 2012 | 1.70 | -41.38 % |
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