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| year | consumption | change |
| 1986 | 2.90 | NA |
| 1987 | 2.80 | -3.45% |
| 1988 | 3.00 | 7.14% |
| 1989 | 3.20 | 6.67% |
| 1990 | 3.10 | -3.13% |
| 1991 | 5.70 | 83.87% |
| 1992 | 3.20 | -43.86% |
| 1993 | 3.10 | -3.13% |
| 1994 | 3.10 | 0.00% |
| 1995 | 3.60 | 16.13% |
| 1996 | 3.60 | 0.00% |
| 1997 | 3.60 | 0.00% |
| 1998 | 3.80 | 5.56% |
| 1999 | 4.20 | 10.53% |
| 2000 | 4.10 | -2.38% |
| 2001 | 4.30 | 4.88% |
| 2002 | 4.30 | 0.00% |
| 2003 | 3.50 | -18.60% |
| 2004 | 3.50 | 0.00% |
| 2005 | 5.60 | 60.00% |
| 2006 | 3.10 | -44.64% |
| 2007 | 2.60 | -16.13% |
| 2008 | 2.20 | -15.38% |
| 2009 | 1.80 | -18.18% |
| 2010 | 1.00 | -44.44% |
| 2011 | 1.30 | 30.00% |
| 2012 | 1.00 | -23.08% |
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