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| year | consumption | change |
| 1986 | 2.50 | NA |
| 1987 | 3.00 | 20.00% |
| 1988 | 3.10 | 3.33% |
| 1989 | 3.20 | 3.23% |
| 1990 | 3.80 | 18.75% |
| 1991 | 3.50 | -7.89% |
| 1992 | 3.90 | 11.43% |
| 1993 | 4.60 | 17.95% |
| 1994 | 4.80 | 4.35% |
| 1995 | 4.80 | 0.00% |
| 1996 | 4.90 | 2.08% |
| 1997 | 4.80 | -2.04% |
| 1998 | 5.10 | 6.25% |
| 1999 | 5.70 | 11.76% |
| 2000 | 5.30 | -7.02% |
| 2001 | 5.30 | 0.00% |
| 2002 | 5.70 | 7.55% |
| 2003 | 5.40 | -5.26% |
| 2004 | 5.50 | 1.85% |
| 2005 | 5.40 | -1.82% |
| 2006 | 5.50 | 1.85% |
| 2007 | 5.20 | -5.45% |
| 2008 | 2.80 | -46.15% |
| 2009 | 3.50 | 25.00% |
| 2010 | 1.20 | -65.71% |
| 2011 | 1.70 | 41.67% |
| 2012 | 1.50 | -11.76% |
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