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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 11.00 | 10.00% |
| 1982 | 11.00 | 0.00% |
| 1983 | 11.00 | 0.00% |
| 1984 | 12.00 | 9.09% |
| 1985 | 12.00 | 0.00% |
| 1986 | 13.00 | 8.33% |
| 1987 | 13.00 | 0.00% |
| 1988 | 14.00 | 7.69% |
| 1989 | 16.00 | 14.29% |
| 1990 | 18.00 | 12.50% |
| 1991 | 18.00 | 0.00% |
| 1992 | 19.00 | 5.56% |
| 1993 | 20.00 | 5.26% |
| 1994 | 21.00 | 5.00% |
| 1995 | 26.00 | 23.81% |
| 1996 | 28.00 | 7.69% |
| 1997 | 31.00 | 10.71% |
| 1998 | 32.00 | 3.23% |
| 1999 | 35.00 | 9.38% |
| 2000 | 38.00 | 8.57% |
| 2001 | 39.00 | 2.63% |
| 2002 | 41.00 | 5.13% |
| 2003 | 44.00 | 7.32% |
| 2004 | 47.00 | 6.82% |
| 2005 | 48.00 | 2.13% |
| 2006 | 51.00 | 6.25% |
| 2007 | 53.00 | 3.92% |
| 2008 | 54.00 | 1.89% |
| 2009 | 53.00 | -1.85% |
| 2010 | 54.00 | 1.89% |
| 2011 | 59.00 | 9.26% |
| 2012 | 63.00 | 6.78% |
| 2013 | 65.00 | 3.17% |
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