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| year | consumption | change |
| 1986 | 26.00 | NA |
| 1987 | 29.00 | 11.54 % |
| 1988 | 31.00 | 6.90 % |
| 1989 | 33.00 | 6.45 % |
| 1990 | 35.00 | 6.06 % |
| 1991 | 36.00 | 2.86 % |
| 1992 | 38.00 | 5.56 % |
| 1993 | 40.00 | 5.26 % |
| 1994 | 43.00 | 7.50 % |
| 1995 | 46.00 | 6.98 % |
| 1996 | 47.00 | 2.17 % |
| 1997 | 47.00 | 0.00 % |
| 1998 | 47.00 | 0.00 % |
| 1999 | 51.00 | 8.51 % |
| 2000 | 48.00 | -5.88 % |
| 2001 | 45.00 | -6.25 % |
| 2002 | 47.00 | 4.44 % |
| 2003 | 47.00 | 0.00 % |
| 2004 | 47.00 | 0.00 % |
| 2005 | 51.00 | 8.51 % |
| 2006 | 50.00 | -1.96 % |
| 2007 | 53.00 | 6.00 % |
| 2008 | 56.00 | 5.66 % |
| 2009 | 54.00 | -3.57 % |
| 2010 | 59.00 | 9.26 % |
| 2011 | 62.00 | 5.08 % |
| 2012 | 63.00 | 1.61 % |
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