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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 23.00 | 21.05 % |
| 1988 | 23.00 | 0.00 % |
| 1989 | 21.00 | -8.70 % |
| 1990 | 23.00 | 9.52 % |
| 1991 | 22.00 | -4.35 % |
| 1992 | 31.00 | 40.91 % |
| 1993 | 42.00 | 35.48 % |
| 1994 | 36.00 | -14.29 % |
| 1995 | 37.00 | 2.78 % |
| 1996 | 40.00 | 8.11 % |
| 1997 | 47.00 | 17.50 % |
| 1998 | 47.00 | 0.00 % |
| 1999 | 38.00 | -19.15 % |
| 2000 | 40.00 | 5.26 % |
| 2001 | 46.00 | 15.00 % |
| 2002 | 46.00 | 0.00 % |
| 2003 | 45.00 | -2.17 % |
| 2004 | 49.00 | 8.89 % |
| 2005 | 50.00 | 2.04 % |
| 2006 | 60.00 | 20.00 % |
| 2007 | 65.00 | 8.33 % |
| 2008 | 64.00 | -1.54 % |
| 2009 | 74.00 | 15.63 % |
| 2010 | 85.00 | 14.86 % |
| 2011 | 82.00 | -3.53 % |
| 2012 | 84.00 | 2.44 % |
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