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| year | consumption | change |
| 1986 | 38.00 | NA |
| 1987 | 40.00 | 5.26% |
| 1988 | 42.00 | 5.00% |
| 1989 | 45.00 | 7.14% |
| 1990 | 46.00 | 2.22% |
| 1991 | 46.00 | 0.00% |
| 1992 | 46.00 | 0.00% |
| 1993 | 43.00 | -6.52% |
| 1994 | 44.00 | 2.33% |
| 1995 | 44.00 | 0.00% |
| 1996 | 42.00 | -4.55% |
| 1997 | 44.00 | 4.76% |
| 1998 | 43.00 | -2.27% |
| 1999 | 43.00 | 0.00% |
| 2000 | 41.00 | -4.65% |
| 2001 | 42.00 | 2.44% |
| 2002 | 43.00 | 2.38% |
| 2003 | 43.00 | 0.00% |
| 2004 | 44.00 | 2.33% |
| 2005 | 43.00 | -2.27% |
| 2006 | 43.00 | 0.00% |
| 2007 | 43.00 | 0.00% |
| 2008 | 41.00 | -4.65% |
| 2009 | 40.00 | -2.44% |
| 2010 | 39.00 | -2.50% |
| 2011 | 38.00 | -2.56% |
| 2012 | 36.00 | -5.26% |
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