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| year | consumption | change |
| 1980 | 3.00 | NA |
| 1981 | 3.50 | 16.67% |
| 1982 | 2.90 | -17.14% |
| 1983 | 2.40 | -17.24% |
| 1984 | 2.00 | -16.67% |
| 1985 | 2.70 | 35.00% |
| 1986 | 2.50 | -7.41% |
| 1987 | 2.60 | 4.00% |
| 1988 | 3.00 | 15.38% |
| 1989 | 3.40 | 13.33% |
| 1990 | 3.50 | 2.94% |
| 1991 | 4.50 | 28.57% |
| 1992 | 5.00 | 11.11% |
| 1993 | 4.30 | -14.00% |
| 1994 | 4.70 | 9.30% |
| 1995 | 4.90 | 4.26% |
| 1996 | 5.00 | 2.04% |
| 1997 | 5.00 | 0.00% |
| 1998 | 5.00 | 0.00% |
| 1999 | 5.00 | 0.00% |
| 2000 | 5.30 | 6.00% |
| 2001 | 5.30 | 0.00% |
| 2002 | 5.40 | 1.89% |
| 2003 | 5.40 | 0.00% |
| 2004 | 6.30 | 16.67% |
| 2005 | 6.80 | 7.94% |
| 2006 | 7.00 | 2.94% |
| 2007 | 7.20 | 2.86% |
| 2008 | 7.20 | 0.00% |
| 2009 | 6.10 | -15.28% |
| 2010 | 6.10 | 0.00% |
| 2011 | 6.10 | 0.00% |
| 2012 | 6.10 | 0.00% |
| 2013 | 6.00 | -1.64% |
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