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| year | consumption | change |
| 1980 | 2.80 | NA |
| 1981 | 3.30 | 17.86% |
| 1982 | 4.60 | 39.39% |
| 1983 | 2.90 | -36.96% |
| 1984 | 3.30 | 13.79% |
| 1985 | 3.10 | -6.06% |
| 1986 | 3.20 | 3.23% |
| 1987 | 3.30 | 3.13% |
| 1988 | 3.20 | -3.03% |
| 1989 | 3.70 | 15.63% |
| 1990 | 3.90 | 5.41% |
| 1991 | 3.90 | 0.00% |
| 1992 | 3.90 | 0.00% |
| 1993 | 3.90 | 0.00% |
| 1994 | 3.80 | -2.56% |
| 1995 | 3.80 | 0.00% |
| 1996 | 3.80 | 0.00% |
| 1997 | 3.80 | 0.00% |
| 1998 | 3.80 | 0.00% |
| 1999 | 3.80 | 0.00% |
| 2000 | 3.70 | -2.63% |
| 2001 | 3.80 | 2.70% |
| 2002 | 3.80 | 0.00% |
| 2003 | 3.80 | 0.00% |
| 2004 | 3.80 | 0.00% |
| 2005 | 4.10 | 7.89% |
| 2006 | 4.10 | 0.00% |
| 2007 | 4.10 | 0.00% |
| 2008 | 4.10 | 0.00% |
| 2009 | 4.10 | 0.00% |
| 2010 | 4.10 | 0.00% |
| 2011 | 2.30 | -43.90% |
| 2012 | 2.30 | 0.00% |
| 2013 | 2.40 | 4.35% |
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