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| year | consumption | change |
| 1986 | 35.00 | NA |
| 1987 | 35.00 | 0.00% |
| 1988 | 36.00 | 2.86% |
| 1989 | 35.00 | -2.78% |
| 1990 | 37.00 | 5.71% |
| 1991 | 39.00 | 5.41% |
| 1992 | 41.00 | 5.13% |
| 1993 | 42.00 | 2.44% |
| 1994 | 44.00 | 4.76% |
| 1995 | 44.00 | 0.00% |
| 1996 | 45.00 | 2.27% |
| 1997 | 46.00 | 2.22% |
| 1998 | 47.00 | 2.17% |
| 1999 | 47.00 | 0.00% |
| 2000 | 46.00 | -2.13% |
| 2001 | 45.00 | -2.17% |
| 2002 | 45.00 | 0.00% |
| 2003 | 45.00 | 0.00% |
| 2004 | 45.00 | 0.00% |
| 2005 | 43.00 | -4.44% |
| 2006 | 43.00 | 0.00% |
| 2007 | 43.00 | 0.00% |
| 2008 | 41.00 | -4.65% |
| 2009 | 38.00 | -7.32% |
| 2010 | 37.00 | -2.63% |
| 2011 | 35.00 | -5.41% |
| 2012 | 33.00 | -5.71% |
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