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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | 2.10 | 31.25% |
| 1988 | 1.60 | -23.81% |
| 1989 | 1.90 | 18.75% |
| 1990 | 2.50 | 31.58% |
| 1991 | 2.70 | 8.00% |
| 1992 | 2.50 | -7.41% |
| 1993 | 2.90 | 16.00% |
| 1994 | 4.90 | 68.97% |
| 1995 | 6.70 | 36.73% |
| 1996 | 8.60 | 28.36% |
| 1997 | 9.30 | 8.14% |
| 1998 | 11.00 | 18.28% |
| 1999 | 14.00 | 27.27% |
| 2000 | 13.00 | -7.14% |
| 2001 | 15.00 | 15.38% |
| 2002 | 16.00 | 6.67% |
| 2003 | 17.00 | 6.25% |
| 2004 | 18.00 | 5.88% |
| 2005 | 19.00 | 5.56% |
| 2006 | 20.00 | 5.26% |
| 2007 | 19.00 | -5.00% |
| 2008 | 21.00 | 10.53% |
| 2009 | 22.00 | 4.76% |
| 2010 | 23.00 | 4.55% |
| 2011 | 17.00 | -26.09% |
| 2012 | 16.00 | -5.88% |
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