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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 4.90 | -3.92 % |
| 1988 | 2.80 | -42.86 % |
| 1989 | 5.60 | 100.00 % |
| 1990 | 5.80 | 3.57 % |
| 1991 | 6.50 | 12.07 % |
| 1992 | 6.80 | 4.62 % |
| 1993 | 4.20 | -38.24 % |
| 1994 | 1.80 | -57.14 % |
| 1995 | 4.00 | 122.22 % |
| 1996 | 5.10 | 27.50 % |
| 1997 | 5.20 | 1.96 % |
| 1998 | 4.10 | -21.15 % |
| 1999 | 3.70 | -9.76 % |
| 2000 | 5.60 | 51.35 % |
| 2001 | 8.20 | 46.43 % |
| 2002 | 7.40 | -9.76 % |
| 2003 | 7.40 | 0.00 % |
| 2004 | 11.00 | 48.65 % |
| 2005 | 12.00 | 9.09 % |
| 2006 | 13.00 | 8.33 % |
| 2007 | 14.00 | 7.69 % |
| 2008 | 14.00 | 0.00 % |
| 2009 | 12.00 | -14.29 % |
| 2010 | 12.00 | 0.00 % |
| 2011 | 13.00 | 8.33 % |
| 2012 | 12.00 | -7.69 % |
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