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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | 1.60 | 6.67% |
| 1988 | 1.80 | 12.50% |
| 1989 | 1.80 | 0.00% |
| 1990 | 1.70 | -5.56% |
| 1991 | 2.30 | 35.29% |
| 1992 | 2.70 | 17.39% |
| 1993 | 2.80 | 3.70% |
| 1994 | 3.20 | 14.29% |
| 1995 | 3.40 | 6.25% |
| 1996 | 4.00 | 17.65% |
| 1997 | 4.40 | 10.00% |
| 1998 | 5.50 | 25.00% |
| 1999 | 5.70 | 3.64% |
| 2000 | 5.60 | -1.75% |
| 2001 | 4.90 | -12.50% |
| 2002 | 5.20 | 6.12% |
| 2003 | 4.90 | -5.77% |
| 2004 | 5.10 | 4.08% |
| 2005 | 5.20 | 1.96% |
| 2006 | 5.50 | 5.77% |
| 2007 | 5.50 | 0.00% |
| 2008 | 5.80 | 5.45% |
| 2009 | 10.00 | 72.41% |
| 2010 | 11.00 | 10.00% |
| 2011 | 10.00 | -9.09% |
| 2012 | 10.00 | 0.00% |
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