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| year | consumption | change |
| 1986 | 2.00 | NA |
| 1987 | 1.80 | -10.00% |
| 1988 | 1.90 | 5.56% |
| 1989 | 1.90 | 0.00% |
| 1990 | 2.80 | 47.37% |
| 1991 | 1.80 | -35.71% |
| 1992 | 2.70 | 50.00% |
| 1993 | 1.80 | -33.33% |
| 1994 | 1.80 | 0.00% |
| 1995 | 1.80 | 0.00% |
| 1996 | 1.90 | 5.56% |
| 1997 | 1.90 | 0.00% |
| 1998 | 1.90 | 0.00% |
| 1999 | 1.70 | -10.53% |
| 2000 | 1.00 | -41.18% |
| 2001 | 1.20 | 20.00% |
| 2002 | 1.20 | 0.00% |
| 2003 | 1.20 | 0.00% |
| 2004 | 1.30 | 8.33% |
| 2005 | 2.00 | 53.85% |
| 2006 | 1.40 | -30.00% |
| 2007 | 1.40 | 0.00% |
| 2008 | 1.20 | -14.29% |
| 2009 | 1.40 | 16.67% |
| 2010 | 1.00 | -28.57% |
| 2011 | 1.10 | 10.00% |
| 2012 | 1.30 | 18.18% |
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