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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 4.90 | -3.92% |
| 1988 | 2.80 | -42.86% |
| 1989 | 5.60 | 100.00% |
| 1990 | 5.80 | 3.57% |
| 1991 | 6.50 | 12.07% |
| 1992 | 6.80 | 4.62% |
| 1993 | 4.20 | -38.24% |
| 1994 | 1.80 | -57.14% |
| 1995 | 4.00 | 122.22% |
| 1996 | 5.10 | 27.50% |
| 1997 | 5.20 | 1.96% |
| 1998 | 4.10 | -21.15% |
| 1999 | 3.70 | -9.76% |
| 2000 | 5.60 | 51.35% |
| 2001 | 8.20 | 46.43% |
| 2002 | 7.40 | -9.76% |
| 2003 | 7.40 | 0.00% |
| 2004 | 11.00 | 48.65% |
| 2005 | 12.00 | 9.09% |
| 2006 | 13.00 | 8.33% |
| 2007 | 14.00 | 7.69% |
| 2008 | 14.00 | 0.00% |
| 2009 | 12.00 | -14.29% |
| 2010 | 12.00 | 0.00% |
| 2011 | 13.00 | 8.33% |
| 2012 | 12.00 | -7.69% |
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