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| year | consumption | change |
| 1980 | 3.00 | NA |
| 1981 | 3.00 | 0.00% |
| 1982 | 3.00 | 0.00% |
| 1983 | 3.00 | 0.00% |
| 1984 | 3.00 | 0.00% |
| 1985 | 3.00 | 0.00% |
| 1986 | 3.00 | 0.00% |
| 1987 | 3.40 | 13.33% |
| 1988 | 3.20 | -5.88% |
| 1989 | 3.40 | 6.25% |
| 1990 | 1.70 | -50.00% |
| 1991 | 1.70 | 0.00% |
| 1992 | 1.40 | -17.65% |
| 1993 | 1.70 | 21.43% |
| 1994 | 2.00 | 17.65% |
| 1995 | 2.20 | 10.00% |
| 1996 | 2.80 | 27.27% |
| 1997 | 2.10 | -25.00% |
| 1998 | 2.20 | 4.76% |
| 1999 | 3.50 | 59.09% |
| 2000 | 3.80 | 8.57% |
| 2001 | 3.50 | -7.89% |
| 2002 | 4.50 | 28.57% |
| 2003 | 4.10 | -8.89% |
| 2004 | 3.80 | -7.32% |
| 2005 | 3.70 | -2.63% |
| 2006 | 3.00 | -18.92% |
| 2007 | 3.70 | 23.33% |
| 2008 | 4.10 | 10.81% |
| 2009 | 4.30 | 4.88% |
| 2010 | 4.60 | 6.98% |
| 2011 | 5.00 | 8.70% |
| 2012 | 4.40 | -12.00% |
| 2013 | 4.60 | 4.55% |
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