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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 5.20 | 1.96% |
| 1988 | 4.80 | -7.69% |
| 1989 | 4.60 | -4.17% |
| 1990 | 4.80 | 4.35% |
| 1991 | 4.30 | -10.42% |
| 1992 | 5.60 | 30.23% |
| 1993 | 6.30 | 12.50% |
| 1994 | 12.00 | 90.48% |
| 1995 | 6.20 | -48.33% |
| 1996 | 7.60 | 22.58% |
| 1997 | 7.90 | 3.95% |
| 1998 | 9.70 | 22.78% |
| 1999 | 9.30 | -4.12% |
| 2000 | 9.10 | -2.15% |
| 2001 | 9.00 | -1.10% |
| 2002 | 9.20 | 2.22% |
| 2003 | 9.40 | 2.17% |
| 2004 | 10.00 | 6.38% |
| 2005 | 9.30 | -7.00% |
| 2006 | 10.00 | 7.53% |
| 2007 | 11.00 | 10.00% |
| 2008 | 11.00 | 0.00% |
| 2009 | 12.00 | 9.09% |
| 2010 | 11.00 | -8.33% |
| 2011 | 14.00 | 27.27% |
| 2012 | 16.00 | 14.29% |
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