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| year | production | consumption |
| 1980 | .00 | 78.00 |
| 1981 | .00 | 77.00 |
| 1982 | .00 | 74.00 |
| 1983 | .00 | 76.00 |
| 1984 | .00 | 75.00 |
| 1985 | .00 | 65.00 |
| 1986 | .00 | 67.00 |
| 1987 | .00 | 70.00 |
| 1988 | .00 | 68.00 |
| 1989 | .00 | 66.00 |
| 1990 | .00 | 70.00 |
| 1991 | .00 | 70.00 |
| 1992 | .00 | 72.00 |
| 1993 | .00 | 71.00 |
| 1994 | .00 | 81.00 |
| 1995 | .00 | 86.00 |
| 1996 | .00 | 72.00 |
| 1997 | .00 | 77.00 |
| 1998 | .00 | 85.00 |
| 1999 | .00 | 78.00 |
| 2000 | .00 | 77.00 |
| 2001 | .00 | 80.00 |
| 2002 | .00 | 77.00 |
| 2003 | .00 | 78.00 |
| 2004 | .00 | 88.00 |
| 2005 | .00 | 84.00 |
| 2006 | .00 | 86.00 |
| 2007 | .00 | 89.00 |
| 2008 | .00 | 52.00 |
| 2009 | .00 | 98.00 |
| 2010 | .00 | 117.00 |
| 2011 | .00 | 125.00 |
| 2012 | .00 | 133.00 |
| 2013 | .00 | 134.00 |
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