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Loading...
| year | production | consumption |
| 1980 | 4.80 | 4.80 |
| 1981 | 4.00 | .00 |
| 1982 | 3.00 | .00 |
| 1983 | 3.00 | .00 |
| 1984 | 58.00 | 82.00 |
| 1985 | 55.00 | 86.00 |
| 1986 | 58.00 | 89.00 |
| 1987 | 58.00 | 99.00 |
| 1988 | 62.00 | 104.00 |
| 1989 | 68.00 | 106.00 |
| 1990 | 77.00 | 96.00 |
| 1991 | 73.00 | 98.00 |
| 1992 | 82.00 | 98.00 |
| 1993 | 70.00 | 109.00 |
| 1994 | 73.00 | 105.00 |
| 1995 | 69.00 | 110.00 |
| 1996 | 68.00 | 112.00 |
| 1997 | 72.00 | 107.00 |
| 1998 | 73.00 | 108.00 |
| 1999 | 71.00 | 130.00 |
| 2000 | 77.00 | 128.00 |
| 2001 | 77.00 | 125.00 |
| 2002 | 77.00 | 118.00 |
| 2003 | 75.00 | 117.00 |
| 2004 | 79.00 | 111.00 |
| 2005 | 78.00 | 110.00 |
| 2006 | 73.00 | 103.00 |
| 2007 | 73.00 | 97.00 |
| 2008 | 72.00 | 100.00 |
| 2009 | 67.00 | 105.00 |
| 2010 | 69.00 | 108.00 |
| 2011 | 68.00 | 104.00 |
| 2012 | 65.00 | 104.00 |
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