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| year | consumption | change |
| 1980 | 13.00 | NA |
| 1981 | 14.00 | 7.69% |
| 1982 | 18.00 | 28.57% |
| 1983 | 20.00 | 11.11% |
| 1984 | 35.00 | 75.00% |
| 1985 | 42.00 | 20.00% |
| 1986 | 39.00 | -7.14% |
| 1987 | 45.00 | 15.38% |
| 1988 | 39.00 | -13.33% |
| 1989 | 55.00 | 41.03% |
| 1990 | 54.00 | -1.82% |
| 1991 | 41.00 | -24.07% |
| 1992 | 31.00 | -24.39% |
| 1993 | 53.00 | 70.97% |
| 1994 | 69.00 | 30.19% |
| 1995 | 58.00 | -15.94% |
| 1996 | 67.00 | 15.52% |
| 1997 | 91.00 | 35.82% |
| 1998 | 104.00 | 14.29% |
| 1999 | 106.00 | 1.92% |
| 2000 | 109.00 | 2.83% |
| 2001 | 135.00 | 23.85% |
| 2002 | 136.00 | 0.74% |
| 2003 | 130.00 | -4.41% |
| 2004 | 131.00 | 0.77% |
| 2005 | 152.00 | 16.03% |
| 2006 | 134.00 | -11.84% |
| 2007 | 100.00 | -25.37% |
| 2008 | 98.00 | -2.00% |
| 2009 | 108.00 | 10.20% |
| 2010 | 116.00 | 7.41% |
| 2011 | 117.00 | 0.86% |
| 2012 | 133.00 | 13.68% |
| 2013 | 144.00 | 8.27% |
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