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| year | consumption | change |
| 1986 | 4.30 | NA |
| 1987 | 4.80 | 11.63% |
| 1988 | 5.10 | 6.25% |
| 1989 | 5.30 | 3.92% |
| 1990 | 5.10 | -3.77% |
| 1991 | 5.40 | 5.88% |
| 1992 | 6.00 | 11.11% |
| 1993 | 6.70 | 11.67% |
| 1994 | 7.70 | 14.93% |
| 1995 | 7.00 | -9.09% |
| 1996 | 8.50 | 21.43% |
| 1997 | 8.90 | 4.71% |
| 1998 | 8.10 | -8.99% |
| 1999 | 8.10 | 0.00% |
| 2000 | 7.00 | -13.58% |
| 2001 | 6.50 | -7.14% |
| 2002 | 5.10 | -21.54% |
| 2003 | 5.80 | 13.73% |
| 2004 | 4.90 | -15.52% |
| 2005 | 5.90 | 20.41% |
| 2006 | 4.50 | -23.73% |
| 2007 | 5.80 | 28.89% |
| 2008 | 7.00 | 20.69% |
| 2009 | 6.50 | -7.14% |
| 2010 | 9.20 | 41.54% |
| 2011 | 10.00 | 8.70% |
| 2012 | 11.00 | 10.00% |
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