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| year | consumption | change |
| 1986 | 6.60 | NA |
| 1987 | 6.60 | 0.00% |
| 1988 | 3.40 | -48.48% |
| 1989 | 3.60 | 5.88% |
| 1990 | 2.40 | -33.33% |
| 1991 | 1.30 | -45.83% |
| 1992 | 1.00 | -23.08% |
| 1993 | 1.30 | 30.00% |
| 1994 | 1.60 | 23.08% |
| 1995 | 1.60 | 0.00% |
| 1996 | 1.40 | -12.50% |
| 1997 | 1.20 | -14.29% |
| 1998 | 1.20 | 0.00% |
| 1999 | 1.30 | 8.33% |
| 2000 | 1.50 | 15.38% |
| 2001 | 1.10 | -26.67% |
| 2002 | 1.20 | 9.09% |
| 2003 | 1.20 | 0.00% |
| 2004 | 1.60 | 33.33% |
| 2005 | 1.90 | 18.75% |
| 2006 | 3.10 | 63.16% |
| 2007 | 3.80 | 22.58% |
| 2008 | 1.80 | -52.63% |
| 2009 | 1.70 | -5.56% |
| 2010 | 1.40 | -17.65% |
| 2011 | 1.00 | -28.57% |
| 2012 | 1.20 | 20.00% |
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