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| year | consumption | change |
| 1980 | 4.40 | NA |
| 1981 | 4.80 | 9.09% |
| 1982 | 5.10 | 6.25% |
| 1983 | 5.60 | 9.80% |
| 1984 | 5.80 | 3.57% |
| 1985 | 5.90 | 1.72% |
| 1986 | 6.60 | 11.86% |
| 1987 | 7.00 | 6.06% |
| 1988 | 7.70 | 10.00% |
| 1989 | 7.70 | 0.00% |
| 1990 | 8.40 | 9.09% |
| 1991 | 8.90 | 5.95% |
| 1992 | 9.80 | 10.11% |
| 1993 | 10.00 | 2.04% |
| 1994 | 10.00 | 0.00% |
| 1995 | 11.00 | 10.00% |
| 1996 | 12.00 | 9.09% |
| 1997 | 12.00 | 0.00% |
| 1998 | 13.00 | 8.33% |
| 1999 | 13.00 | 0.00% |
| 2000 | 13.00 | 0.00% |
| 2001 | 14.00 | 7.69% |
| 2002 | 15.00 | 7.14% |
| 2003 | 16.00 | 6.67% |
| 2004 | 17.00 | 6.25% |
| 2005 | 18.00 | 5.88% |
| 2006 | 20.00 | 11.11% |
| 2007 | 21.00 | 5.00% |
| 2008 | 22.00 | 4.76% |
| 2009 | 22.00 | 0.00% |
| 2010 | 24.00 | 9.09% |
| 2011 | 25.00 | 4.17% |
| 2012 | 27.00 | 8.00% |
| 2013 | 27.00 | 0.00% |
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