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| year | consumption | change |
| 1986 | 1.40 | NA |
| 1987 | 1.30 | -7.14% |
| 1988 | 2.80 | 115.38% |
| 1989 | 2.90 | 3.57% |
| 1990 | 2.90 | 0.00% |
| 1991 | 3.50 | 20.69% |
| 1992 | 4.60 | 31.43% |
| 1993 | 12.00 | 160.87% |
| 1994 | 18.00 | 50.00% |
| 1995 | 16.00 | -11.11% |
| 1996 | 19.00 | 18.75% |
| 1997 | 13.00 | -31.58% |
| 1998 | 3.20 | -75.38% |
| 1999 | 3.10 | -3.13% |
| 2000 | 26.00 | 738.71% |
| 2001 | 29.00 | 11.54% |
| 2002 | 12.00 | -58.62% |
| 2003 | 40.00 | 233.33% |
| 2004 | 38.00 | -5.00% |
| 2005 | 29.00 | -23.68% |
| 2006 | 28.00 | -3.45% |
| 2007 | 31.00 | 10.71% |
| 2008 | 37.00 | 19.35% |
| 2009 | 28.00 | -24.32% |
| 2010 | 49.00 | 75.00% |
| 2011 | 52.00 | 6.12% |
| 2012 | 48.00 | -7.69% |
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