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| year | consumption | change |
| 1986 | 20.00 | NA |
| 1987 | 20.00 | 0.00% |
| 1988 | 22.00 | 10.00% |
| 1989 | 26.00 | 18.18% |
| 1990 | 27.00 | 3.85% |
| 1991 | 27.00 | 0.00% |
| 1992 | 30.00 | 11.11% |
| 1993 | 33.00 | 10.00% |
| 1994 | 35.00 | 6.06% |
| 1995 | 39.00 | 11.43% |
| 1996 | 39.00 | 0.00% |
| 1997 | 39.00 | 0.00% |
| 1998 | 36.00 | -7.69% |
| 1999 | 32.00 | -11.11% |
| 2000 | 33.00 | 3.13% |
| 2001 | 28.00 | -15.15% |
| 2002 | 25.00 | -10.71% |
| 2003 | 30.00 | 20.00% |
| 2004 | 30.00 | 0.00% |
| 2005 | 35.00 | 16.67% |
| 2006 | 40.00 | 14.29% |
| 2007 | 50.00 | 25.00% |
| 2008 | 51.00 | 2.00% |
| 2009 | 38.00 | -25.49% |
| 2010 | 33.00 | -13.16% |
| 2011 | 33.00 | 0.00% |
| 2012 | 27.00 | -18.18% |
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