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| year | consumption | change |
| 1986 | 3.60 | NA |
| 1987 | 3.70 | 2.78 % |
| 1988 | 5.10 | 37.84 % |
| 1989 | 3.70 | -27.45 % |
| 1990 | 4.20 | 13.51 % |
| 1991 | 5.20 | 23.81 % |
| 1992 | 5.20 | 0.00 % |
| 1993 | 5.40 | 3.85 % |
| 1994 | 5.60 | 3.70 % |
| 1995 | 5.90 | 5.36 % |
| 1996 | 5.00 | -15.25 % |
| 1997 | 4.20 | -16.00 % |
| 1998 | 4.60 | 9.52 % |
| 1999 | 4.80 | 4.35 % |
| 2000 | 5.40 | 12.50 % |
| 2001 | 4.50 | -16.67 % |
| 2002 | 5.40 | 20.00 % |
| 2003 | 5.60 | 3.70 % |
| 2004 | 5.60 | 0.00 % |
| 2005 | 7.00 | 25.00 % |
| 2006 | 5.80 | -17.14 % |
| 2007 | 5.80 | 0.00 % |
| 2008 | 5.50 | -5.17 % |
| 2009 | 5.80 | 5.45 % |
| 2010 | 6.00 | 3.45 % |
| 2011 | 5.20 | -13.33 % |
| 2012 | 4.10 | -21.15 % |
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