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| year | consumption | change |
| 1986 | 141.00 | NA |
| 1987 | 138.00 | -2.13% |
| 1988 | 138.10 | 0.07% |
| 1989 | 123.20 | -10.79% |
| 1990 | 72.30 | -41.31% |
| 1991 | 67.40 | -6.78% |
| 1992 | 64.30 | -4.60% |
| 1993 | 74.40 | 15.71% |
| 1994 | 68.60 | -7.80% |
| 1995 | 71.60 | 4.37% |
| 1996 | 78.60 | 9.78% |
| 1997 | 79.10 | 0.64% |
| 1998 | 88.80 | 12.26% |
| 1999 | 82.40 | -7.21% |
| 2000 | 76.80 | -6.80% |
| 2001 | 80.60 | 4.95% |
| 2002 | 51.60 | -35.98% |
| 2003 | 63.40 | 22.87% |
| 2004 | 73.10 | 15.30% |
| 2005 | 77.90 | 6.57% |
| 2006 | 59.90 | -23.11% |
| 2007 | 38.20 | -36.23% |
| 2008 | 19.30 | -49.48% |
| 2009 | 23.50 | 21.76% |
| 2010 | 26.30 | 11.91% |
| 2011 | 18.20 | -30.80% |
| 2012 | 11.10 | -39.01% |
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