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| year | consumption | change |
| 1986 | 1.40 | NA |
| 1987 | 1.30 | -7.14% |
| 1988 | 1.70 | 30.77% |
| 1989 | 2.00 | 17.65% |
| 1990 | 2.50 | 25.00% |
| 1991 | 2.60 | 4.00% |
| 1992 | 3.10 | 19.23% |
| 1993 | 3.30 | 6.45% |
| 1994 | 3.30 | 0.00% |
| 1995 | 3.80 | 15.15% |
| 1996 | 3.50 | -7.89% |
| 1997 | 3.50 | 0.00% |
| 1998 | 3.60 | 2.86% |
| 1999 | 3.60 | 0.00% |
| 2000 | 5.20 | 44.44% |
| 2001 | 5.20 | 0.00% |
| 2002 | 3.80 | -26.92% |
| 2003 | 5.30 | 39.47% |
| 2004 | 5.30 | 0.00% |
| 2005 | 5.40 | 1.89% |
| 2006 | 6.00 | 11.11% |
| 2007 | 6.20 | 3.33% |
| 2008 | 5.80 | -6.45% |
| 2009 | 6.00 | 3.45% |
| 2010 | 6.60 | 10.00% |
| 2011 | 8.10 | 22.73% |
| 2012 | 7.60 | -6.17% |
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