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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 11.00 | 10.00% |
| 1982 | 12.00 | 9.09% |
| 1983 | 13.00 | 8.33% |
| 1984 | 14.00 | 7.69% |
| 1985 | 15.00 | 7.14% |
| 1986 | 16.00 | 6.67% |
| 1987 | 20.00 | 25.00% |
| 1988 | 21.00 | 5.00% |
| 1989 | 21.00 | 0.00% |
| 1990 | 22.00 | 4.76% |
| 1991 | 23.00 | 4.55% |
| 1992 | 24.00 | 4.35% |
| 1993 | 25.00 | 4.17% |
| 1994 | 23.00 | -8.00% |
| 1995 | 27.00 | 17.39% |
| 1996 | 30.00 | 11.11% |
| 1997 | 31.00 | 3.33% |
| 1998 | 32.00 | 3.23% |
| 1999 | 32.00 | 0.00% |
| 2000 | 34.00 | 6.25% |
| 2001 | 35.00 | 2.94% |
| 2002 | 36.00 | 2.86% |
| 2003 | 36.00 | 0.00% |
| 2004 | 37.00 | 2.78% |
| 2005 | 38.00 | 2.70% |
| 2006 | 38.00 | 0.00% |
| 2007 | 39.00 | 2.63% |
| 2008 | 39.00 | 0.00% |
| 2009 | 39.00 | 0.00% |
| 2010 | 40.00 | 2.56% |
| 2011 | 40.00 | 0.00% |
| 2012 | 41.00 | 2.50% |
| 2013 | 40.00 | -2.44% |
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