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| year | consumption | change |
| 1986 | 25.20 | NA |
| 1987 | 21.60 | -14.29% |
| 1988 | 21.20 | -1.85% |
| 1989 | 19.50 | -8.02% |
| 1990 | 18.30 | -6.15% |
| 1991 | 17.30 | -5.46% |
| 1992 | 25.50 | 47.40% |
| 1993 | 22.10 | -13.33% |
| 1994 | 25.60 | 15.84% |
| 1995 | 25.40 | -0.78% |
| 1996 | 25.80 | 1.57% |
| 1997 | 17.30 | -32.95% |
| 1998 | 15.50 | -10.40% |
| 1999 | 16.80 | 8.39% |
| 2000 | 21.20 | 26.19% |
| 2001 | 17.60 | -16.98% |
| 2002 | 15.20 | -13.64% |
| 2003 | 16.60 | 9.21% |
| 2004 | 20.20 | 21.69% |
| 2005 | 19.40 | -3.96% |
| 2006 | 22.80 | 17.53% |
| 2007 | 25.40 | 11.40% |
| 2008 | 15.20 | -40.16% |
| 2009 | 14.20 | -6.58% |
| 2010 | 14.40 | 1.41% |
| 2011 | 6.80 | -52.78% |
| 2012 | 8.50 | 25.00% |
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