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| year | consumption | change |
| 1986 | 1.80 | NA |
| 1987 | 1.70 | -5.56% |
| 1988 | 2.00 | 17.65% |
| 1989 | 2.10 | 5.00% |
| 1990 | 2.30 | 9.52% |
| 1991 | 2.70 | 17.39% |
| 1992 | 3.20 | 18.52% |
| 1993 | 3.00 | -6.25% |
| 1994 | 3.10 | 3.33% |
| 1995 | 3.00 | -3.23% |
| 1996 | 3.00 | 0.00% |
| 1997 | 3.00 | 0.00% |
| 1998 | 4.20 | 40.00% |
| 1999 | 4.20 | 0.00% |
| 2000 | 4.20 | 0.00% |
| 2001 | 4.80 | 14.29% |
| 2002 | 5.00 | 4.17% |
| 2003 | 5.00 | 0.00% |
| 2004 | 5.10 | 2.00% |
| 2005 | 5.30 | 3.92% |
| 2006 | 5.10 | -3.77% |
| 2007 | 5.20 | 1.96% |
| 2008 | 5.30 | 1.92% |
| 2009 | 7.40 | 39.62% |
| 2010 | 7.40 | 0.00% |
| 2011 | 7.40 | 0.00% |
| 2012 | 7.40 | 0.00% |
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