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| year | consumption | change |
| 1986 | 9.40 | NA |
| 1987 | 8.40 | -10.64% |
| 1988 | 8.20 | -2.38% |
| 1989 | 6.80 | -17.07% |
| 1990 | 6.00 | -11.76% |
| 1991 | 11.00 | 83.33% |
| 1992 | 8.80 | -20.00% |
| 1993 | 11.00 | 25.00% |
| 1994 | 16.00 | 45.45% |
| 1995 | 20.00 | 25.00% |
| 1996 | 18.00 | -10.00% |
| 1997 | 28.00 | 55.56% |
| 1998 | 29.00 | 3.57% |
| 1999 | 36.00 | 24.14% |
| 2000 | 36.00 | 0.00% |
| 2001 | 32.00 | -11.11% |
| 2002 | 34.00 | 6.25% |
| 2003 | 37.00 | 8.82% |
| 2004 | 36.00 | -2.70% |
| 2005 | 31.00 | -13.89% |
| 2006 | 33.00 | 6.45% |
| 2007 | 30.00 | -9.09% |
| 2008 | 37.00 | 23.33% |
| 2009 | 53.00 | 43.24% |
| 2010 | 46.00 | -13.21% |
| 2011 | 50.00 | 8.70% |
| 2012 | 53.00 | 6.00% |
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