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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 11.00 | 10.00% |
| 1982 | 15.00 | 36.36% |
| 1983 | 17.00 | 13.33% |
| 1984 | 19.00 | 11.76% |
| 1985 | 22.00 | 15.79% |
| 1986 | 24.00 | 9.09% |
| 1987 | 26.00 | 8.33% |
| 1988 | 30.00 | 15.38% |
| 1989 | 32.00 | 6.67% |
| 1990 | 31.00 | -3.13% |
| 1991 | 31.00 | 0.00% |
| 1992 | 35.00 | 12.90% |
| 1993 | 34.00 | -2.86% |
| 1994 | 40.00 | 17.65% |
| 1995 | 39.00 | -2.50% |
| 1996 | 38.00 | -2.56% |
| 1997 | 43.00 | 13.16% |
| 1998 | 40.00 | -6.98% |
| 1999 | 45.00 | 12.50% |
| 2000 | 47.00 | 4.44% |
| 2001 | 50.00 | 6.38% |
| 2002 | 52.00 | 4.00% |
| 2003 | 57.00 | 9.62% |
| 2004 | 60.00 | 5.26% |
| 2005 | 67.00 | 11.67% |
| 2006 | 73.00 | 8.96% |
| 2007 | 72.00 | -1.37% |
| 2008 | 69.00 | -4.17% |
| 2009 | 72.00 | 4.35% |
| 2010 | 75.00 | 4.17% |
| 2011 | 74.00 | -1.33% |
| 2012 | 77.00 | 4.05% |
| 2013 | 77.00 | 0.00% |
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