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| year | consumption | change |
| 1986 | 7.60 | NA |
| 1987 | 8.40 | 10.53% |
| 1988 | 11.00 | 30.95% |
| 1989 | 14.00 | 27.27% |
| 1990 | 9.30 | -33.57% |
| 1991 | 9.50 | 2.15% |
| 1992 | 7.40 | -22.11% |
| 1993 | 6.90 | -6.76% |
| 1994 | 4.10 | -40.58% |
| 1995 | 7.20 | 75.61% |
| 1996 | 3.60 | -50.00% |
| 1997 | 7.30 | 102.78% |
| 1998 | 10.00 | 36.99% |
| 1999 | 12.00 | 20.00% |
| 2000 | 11.00 | -8.33% |
| 2001 | 4.90 | -55.45% |
| 2002 | 9.50 | 93.88% |
| 2003 | 9.20 | -3.16% |
| 2004 | 12.00 | 30.43% |
| 2005 | 11.00 | -8.33% |
| 2006 | 13.00 | 18.18% |
| 2007 | 11.00 | -15.38% |
| 2008 | 15.00 | 36.36% |
| 2009 | 17.00 | 13.33% |
| 2010 | 13.00 | -23.53% |
| 2011 | 14.00 | 7.69% |
| 2012 | 15.00 | 7.14% |
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