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| year | consumption | change |
| 1986 | 5.40 | NA |
| 1987 | 6.90 | 27.78% |
| 1988 | 6.50 | -5.80% |
| 1989 | 8.90 | 36.92% |
| 1990 | 7.90 | -11.24% |
| 1991 | 7.40 | -6.33% |
| 1992 | 9.20 | 24.32% |
| 1993 | 8.90 | -3.26% |
| 1994 | 10.00 | 12.36% |
| 1995 | 14.00 | 40.00% |
| 1996 | 12.00 | -14.29% |
| 1997 | 13.00 | 8.33% |
| 1998 | 15.00 | 15.38% |
| 1999 | 18.00 | 20.00% |
| 2000 | 15.00 | -16.67% |
| 2001 | 14.00 | -6.67% |
| 2002 | 17.00 | 21.43% |
| 2003 | 18.00 | 5.88% |
| 2004 | 18.00 | 0.00% |
| 2005 | 17.00 | -5.56% |
| 2006 | 17.00 | 0.00% |
| 2007 | 18.00 | 5.88% |
| 2008 | 19.00 | 5.56% |
| 2009 | 19.00 | 0.00% |
| 2010 | 19.00 | 0.00% |
| 2011 | 21.00 | 10.53% |
| 2012 | 22.00 | 4.76% |
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