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| year | consumption | change |
| 1980 | 27.00 | NA |
| 1981 | 32.00 | 18.52% |
| 1982 | 32.00 | 0.00% |
| 1983 | 35.00 | 9.38% |
| 1984 | 37.00 | 5.71% |
| 1985 | 39.00 | 5.41% |
| 1986 | 40.00 | 2.56% |
| 1987 | 43.00 | 7.50% |
| 1988 | 47.00 | 9.30% |
| 1989 | 46.00 | -2.13% |
| 1990 | 47.00 | 2.17% |
| 1991 | 49.00 | 4.26% |
| 1992 | 53.00 | 8.16% |
| 1993 | 55.00 | 3.77% |
| 1994 | 55.00 | 0.00% |
| 1995 | 56.00 | 1.82% |
| 1996 | 58.00 | 3.57% |
| 1997 | 60.00 | 3.45% |
| 1998 | 61.00 | 1.67% |
| 1999 | 60.00 | -1.64% |
| 2000 | 63.00 | 5.00% |
| 2001 | 65.00 | 3.17% |
| 2002 | 64.00 | -1.54% |
| 2003 | 65.00 | 1.56% |
| 2004 | 70.00 | 7.69% |
| 2005 | 72.00 | 2.86% |
| 2006 | 78.00 | 8.33% |
| 2007 | 80.00 | 2.56% |
| 2008 | 84.00 | 5.00% |
| 2009 | 84.00 | 0.00% |
| 2010 | 88.00 | 4.76% |
| 2011 | 91.00 | 3.41% |
| 2012 | 94.00 | 3.30% |
| 2013 | 95.00 | 1.06% |
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