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| year | consumption | change |
| 1986 | 1.10 | NA |
| 1987 | 2.00 | 81.82% |
| 1988 | 2.00 | 0.00% |
| 1989 | 3.10 | 55.00% |
| 1990 | 2.50 | -19.35% |
| 1991 | 2.90 | 16.00% |
| 1992 | 1.60 | -44.83% |
| 1993 | 1.40 | -12.50% |
| 1994 | 1.50 | 7.14% |
| 1995 | 1.50 | 0.00% |
| 1996 | 1.50 | 0.00% |
| 1997 | 1.60 | 6.67% |
| 1998 | 1.60 | 0.00% |
| 1999 | 2.30 | 43.75% |
| 2000 | 3.00 | 30.43% |
| 2001 | 2.20 | -26.67% |
| 2002 | 3.20 | 45.45% |
| 2003 | 4.50 | 40.63% |
| 2004 | 4.80 | 6.67% |
| 2005 | 4.60 | -4.17% |
| 2006 | 4.00 | -13.04% |
| 2007 | 4.00 | 0.00% |
| 2008 | 4.20 | 5.00% |
| 2009 | 4.30 | 2.38% |
| 2010 | 4.60 | 6.98% |
| 2011 | 3.90 | -15.22% |
| 2012 | 3.40 | -12.82% |
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