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| year | consumption | change |
| 1980 | 37.00 | NA |
| 1981 | 40.00 | 8.11% |
| 1982 | 43.00 | 7.50% |
| 1983 | 47.00 | 9.30% |
| 1984 | 52.00 | 10.64% |
| 1985 | 55.00 | 5.77% |
| 1986 | 56.00 | 1.82% |
| 1987 | 60.00 | 7.14% |
| 1988 | 60.00 | 0.00% |
| 1989 | 66.00 | 10.00% |
| 1990 | 70.00 | 6.06% |
| 1991 | 79.00 | 12.86% |
| 1992 | 83.00 | 5.06% |
| 1993 | 87.00 | 4.82% |
| 1994 | 86.00 | -1.15% |
| 1995 | 95.00 | 10.47% |
| 1996 | 102.00 | 7.37% |
| 1997 | 99.00 | -2.94% |
| 1998 | 102.00 | 3.03% |
| 1999 | 106.00 | 3.92% |
| 2000 | 105.00 | -0.94% |
| 2001 | 109.00 | 3.81% |
| 2002 | 107.00 | -1.83% |
| 2003 | 113.00 | 5.61% |
| 2004 | 117.00 | 3.54% |
| 2005 | 120.00 | 2.56% |
| 2006 | 117.00 | -2.50% |
| 2007 | 114.00 | -2.56% |
| 2008 | 121.00 | 6.14% |
| 2009 | 116.00 | -4.13% |
| 2010 | 130.00 | 12.07% |
| 2011 | 115.00 | -11.54% |
| 2012 | 127.00 | 10.43% |
| 2013 | 133.00 | 4.72% |
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