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| year | consumption | change |
| 1980 | 3.00 | NA |
| 1981 | 3.50 | 16.67% |
| 1982 | 4.70 | 34.29% |
| 1983 | 6.30 | 34.04% |
| 1984 | 7.20 | 14.29% |
| 1985 | 7.70 | 6.94% |
| 1986 | 7.60 | -1.30% |
| 1987 | 7.20 | -5.26% |
| 1988 | 5.40 | -25.00% |
| 1989 | 5.80 | 7.41% |
| 1990 | 5.30 | -8.62% |
| 1991 | 5.10 | -3.77% |
| 1992 | 4.30 | -15.69% |
| 1993 | 4.90 | 13.95% |
| 1994 | 5.80 | 18.37% |
| 1995 | 9.80 | 68.97% |
| 1996 | 11.00 | 12.24% |
| 1997 | 12.00 | 9.09% |
| 1998 | 14.00 | 16.67% |
| 1999 | 14.00 | 0.00% |
| 2000 | 16.00 | 14.29% |
| 2001 | 18.00 | 12.50% |
| 2002 | 20.00 | 11.11% |
| 2003 | 21.00 | 5.00% |
| 2004 | 23.00 | 9.52% |
| 2005 | 26.00 | 13.04% |
| 2006 | 27.00 | 3.85% |
| 2007 | 28.00 | 3.70% |
| 2008 | 30.00 | 7.14% |
| 2009 | 30.00 | 0.00% |
| 2010 | 36.00 | 20.00% |
| 2011 | 33.00 | -8.33% |
| 2012 | 27.00 | -18.18% |
| 2013 | 20.00 | -25.93% |
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