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| year | consumption | change |
| 1986 | 2.50 | NA |
| 1987 | 3.00 | 20.00% |
| 1988 | 3.20 | 6.67% |
| 1989 | 3.30 | 3.13% |
| 1990 | 3.60 | 9.09% |
| 1991 | 3.30 | -8.33% |
| 1992 | 5.40 | 63.64% |
| 1993 | 5.20 | -3.70% |
| 1994 | 6.50 | 25.00% |
| 1995 | 8.10 | 24.62% |
| 1996 | 8.80 | 8.64% |
| 1997 | 10.00 | 13.64% |
| 1998 | 15.00 | 50.00% |
| 1999 | 15.00 | 0.00% |
| 2000 | 14.00 | -6.67% |
| 2001 | 15.00 | 7.14% |
| 2002 | 15.00 | 0.00% |
| 2003 | 15.00 | 0.00% |
| 2004 | 17.00 | 13.33% |
| 2005 | 17.00 | 0.00% |
| 2006 | 15.00 | -11.76% |
| 2007 | 17.00 | 13.33% |
| 2008 | 14.00 | -17.65% |
| 2009 | 17.00 | 21.43% |
| 2010 | 9.90 | -41.76% |
| 2011 | 11.00 | 11.11% |
| 2012 | 11.00 | 0.00% |
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