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| year | consumption | change |
| 1980 | 9.40 | NA |
| 1981 | 10.00 | 6.38% |
| 1982 | 11.00 | 10.00% |
| 1983 | 12.00 | 9.09% |
| 1984 | 13.00 | 8.33% |
| 1985 | 14.00 | 7.69% |
| 1986 | 14.00 | 0.00% |
| 1987 | 15.00 | 7.14% |
| 1988 | 17.00 | 13.33% |
| 1989 | 19.00 | 11.76% |
| 1990 | 22.00 | 15.79% |
| 1991 | 24.00 | 9.09% |
| 1992 | 26.00 | 8.33% |
| 1993 | 29.00 | 11.54% |
| 1994 | 34.00 | 17.24% |
| 1995 | 39.00 | 14.71% |
| 1996 | 43.00 | 10.26% |
| 1997 | 51.00 | 18.60% |
| 1998 | 52.00 | 1.96% |
| 1999 | 56.00 | 7.69% |
| 2000 | 60.00 | 7.14% |
| 2001 | 61.00 | 1.67% |
| 2002 | 64.00 | 4.92% |
| 2003 | 68.00 | 6.25% |
| 2004 | 71.00 | 4.41% |
| 2005 | 69.00 | -2.82% |
| 2006 | 75.00 | 8.70% |
| 2007 | 82.00 | 9.33% |
| 2008 | 84.00 | 2.44% |
| 2009 | 103.00 | 22.62% |
| 2010 | 110.00 | 6.80% |
| 2011 | 110.00 | 0.00% |
| 2012 | 119.00 | 8.18% |
| 2013 | 125.00 | 5.04% |
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