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| year | consumption | change |
| 1986 | 97.00 | NA |
| 1987 | 99.00 | 2.06 % |
| 1988 | 88.00 | -11.11 % |
| 1989 | 68.00 | -22.73 % |
| 1990 | 63.00 | -7.35 % |
| 1991 | 65.00 | 3.17 % |
| 1992 | 49.00 | -24.62 % |
| 1993 | 54.00 | 10.20 % |
| 1994 | 43.00 | -20.37 % |
| 1995 | 36.00 | -16.28 % |
| 1996 | 39.00 | 8.33 % |
| 1997 | 51.00 | 30.77 % |
| 1998 | 49.00 | -3.92 % |
| 1999 | 44.00 | -10.20 % |
| 2000 | 37.00 | -15.91 % |
| 2001 | 32.00 | -13.51 % |
| 2002 | 23.00 | -28.13 % |
| 2003 | 30.00 | 30.43 % |
| 2004 | 33.00 | 10.00 % |
| 2005 | 47.00 | 42.42 % |
| 2006 | 49.00 | 4.26 % |
| 2007 | 62.00 | 26.53 % |
| 2008 | 75.00 | 20.97 % |
| 2009 | 60.00 | -20.00 % |
| 2010 | 77.00 | 28.33 % |
| 2011 | 82.00 | 6.49 % |
| 2012 | 93.00 | 13.41 % |
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