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| year | consumption | change |
| 1986 | 21.00 | NA |
| 1987 | 20.00 | -4.76% |
| 1988 | 20.00 | 0.00% |
| 1989 | 21.00 | 5.00% |
| 1990 | 26.00 | 23.81% |
| 1991 | 26.00 | 0.00% |
| 1992 | 30.00 | 15.38% |
| 1993 | 30.00 | 0.00% |
| 1994 | 34.00 | 13.33% |
| 1995 | 37.00 | 8.82% |
| 1996 | 38.00 | 2.70% |
| 1997 | 40.00 | 5.26% |
| 1998 | 40.00 | 0.00% |
| 1999 | 41.00 | 2.50% |
| 2000 | 43.00 | 4.88% |
| 2001 | 43.00 | 0.00% |
| 2002 | 46.00 | 6.98% |
| 2003 | 48.00 | 4.35% |
| 2004 | 48.00 | 0.00% |
| 2005 | 51.00 | 6.25% |
| 2006 | 52.00 | 1.96% |
| 2007 | 53.00 | 1.92% |
| 2008 | 54.00 | 1.89% |
| 2009 | 51.00 | -5.56% |
| 2010 | 51.00 | 0.00% |
| 2011 | 52.00 | 1.96% |
| 2012 | 53.00 | 1.92% |
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