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| year | consumption | change |
| 1980 | 20.00 | NA |
| 1981 | 21.00 | 5.00% |
| 1982 | 23.00 | 9.52% |
| 1983 | 23.00 | 0.00% |
| 1984 | 26.00 | 13.04% |
| 1985 | 29.00 | 11.54% |
| 1986 | 30.00 | 3.45% |
| 1987 | 31.00 | 3.33% |
| 1988 | 32.00 | 3.23% |
| 1989 | 33.00 | 3.13% |
| 1990 | 33.00 | 0.00% |
| 1991 | 33.00 | 0.00% |
| 1992 | 24.00 | -27.27% |
| 1993 | 23.00 | -4.17% |
| 1994 | 23.00 | 0.00% |
| 1995 | 23.00 | 0.00% |
| 1996 | 21.00 | -8.70% |
| 1997 | 19.00 | -9.52% |
| 1998 | 18.00 | -5.26% |
| 1999 | 15.00 | -16.67% |
| 2000 | 16.00 | 6.67% |
| 2001 | 16.00 | 0.00% |
| 2002 | 16.00 | 0.00% |
| 2003 | 17.00 | 6.25% |
| 2004 | 18.00 | 5.88% |
| 2005 | 19.00 | 5.56% |
| 2006 | 18.00 | -5.26% |
| 2007 | 17.00 | -5.56% |
| 2008 | 19.00 | 11.76% |
| 2009 | 17.00 | -10.53% |
| 2010 | 18.00 | 5.88% |
| 2011 | 16.00 | -11.11% |
| 2012 | 16.00 | 0.00% |
| 2013 | 16.00 | 0.00% |
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