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| year | consumption | change |
| 1980 | 41.00 | NA |
| 1981 | 39.00 | -4.88% |
| 1982 | 39.00 | 0.00% |
| 1983 | 37.00 | -5.13% |
| 1984 | 36.00 | -2.70% |
| 1985 | 37.00 | 2.78% |
| 1986 | 39.00 | 5.41% |
| 1987 | 35.00 | -10.26% |
| 1988 | 38.00 | 8.57% |
| 1989 | 42.00 | 10.53% |
| 1990 | 42.00 | 0.00% |
| 1991 | 37.00 | -11.90% |
| 1992 | 41.00 | 10.81% |
| 1993 | 42.00 | 2.44% |
| 1994 | 44.00 | 4.76% |
| 1995 | 46.00 | 4.55% |
| 1996 | 48.00 | 4.35% |
| 1997 | 44.00 | -8.33% |
| 1998 | 51.00 | 15.91% |
| 1999 | 52.00 | 1.96% |
| 2000 | 57.00 | 9.62% |
| 2001 | 52.00 | -8.77% |
| 2002 | 51.00 | -1.92% |
| 2003 | 54.00 | 5.88% |
| 2004 | 59.00 | 9.26% |
| 2005 | 66.00 | 11.86% |
| 2006 | 73.00 | 10.61% |
| 2007 | 73.00 | 0.00% |
| 2008 | 68.00 | -6.85% |
| 2009 | 76.00 | 11.76% |
| 2010 | 80.00 | 5.26% |
| 2011 | 87.00 | 8.75% |
| 2012 | 85.00 | -2.30% |
| 2013 | 84.00 | -1.18% |
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