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| year | consumption | change |
| 1986 | 15.00 | NA |
| 1987 | 12.00 | -20.00% |
| 1988 | 12.00 | 0.00% |
| 1989 | 11.00 | -8.33% |
| 1990 | 9.30 | -15.45% |
| 1991 | 9.60 | 3.23% |
| 1992 | 11.00 | 14.58% |
| 1993 | 7.30 | -33.64% |
| 1994 | 8.10 | 10.96% |
| 1995 | 7.90 | -2.47% |
| 1996 | 7.40 | -6.33% |
| 1997 | 6.00 | -18.92% |
| 1998 | 7.50 | 25.00% |
| 1999 | 5.00 | -33.33% |
| 2000 | 3.60 | -28.00% |
| 2001 | 4.20 | 16.67% |
| 2002 | 3.00 | -28.57% |
| 2003 | 3.20 | 6.67% |
| 2004 | 3.20 | 0.00% |
| 2005 | 2.50 | -21.88% |
| 2006 | 2.80 | 12.00% |
| 2007 | 2.20 | -21.43% |
| 2008 | 2.00 | -9.09% |
| 2009 | 1.50 | -25.00% |
| 2010 | 1.40 | -6.67% |
| 2011 | 1.00 | -28.57% |
| 2012 | 1.20 | 20.00% |
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