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| year | consumption | change |
| 1986 | 4.90 | NA |
| 1987 | 4.70 | -4.08% |
| 1988 | 5.90 | 25.53% |
| 1989 | 7.00 | 18.64% |
| 1990 | 6.60 | -5.71% |
| 1991 | 6.40 | -3.03% |
| 1992 | 7.00 | 9.38% |
| 1993 | 8.80 | 25.71% |
| 1994 | 9.60 | 9.09% |
| 1995 | 13.00 | 35.42% |
| 1996 | 9.70 | -25.38% |
| 1997 | 11.00 | 13.40% |
| 1998 | 14.00 | 27.27% |
| 1999 | 15.00 | 7.14% |
| 2000 | 11.00 | -26.67% |
| 2001 | 14.00 | 27.27% |
| 2002 | 18.00 | 28.57% |
| 2003 | 16.00 | -11.11% |
| 2004 | 17.00 | 6.25% |
| 2005 | 17.00 | 0.00% |
| 2006 | 15.00 | -11.76% |
| 2007 | 15.00 | 0.00% |
| 2008 | 15.00 | 0.00% |
| 2009 | 13.00 | -13.33% |
| 2010 | 14.00 | 7.69% |
| 2011 | 14.00 | 0.00% |
| 2012 | 15.00 | 7.14% |
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