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| year | production | change |
| 1980 | 3.60 | NA |
| 1981 | 3.70 | 2.78% |
| 1982 | 3.70 | 0.00% |
| 1983 | 3.70 | 0.00% |
| 1984 | 3.70 | 0.00% |
| 1985 | 3.80 | 2.70% |
| 1986 | 3.80 | 0.00% |
| 1987 | 4.20 | 10.53% |
| 1988 | 3.90 | -7.14% |
| 1989 | 4.10 | 5.13% |
| 1990 | 3.10 | -24.39% |
| 1991 | 3.60 | 16.13% |
| 1992 | 3.30 | -8.33% |
| 1993 | 3.40 | 3.03% |
| 1994 | 3.90 | 14.71% |
| 1995 | 4.40 | 12.82% |
| 1996 | 5.90 | 34.09% |
| 1997 | 5.10 | -13.56% |
| 1998 | 5.00 | -1.96% |
| 1999 | 5.30 | 6.00% |
| 2000 | 4.70 | -11.32% |
| 2001 | 3.60 | -23.40% |
| 2002 | 3.60 | 0.00% |
| 2003 | 5.20 | 44.44% |
| 2004 | 5.50 | 5.77% |
| 2005 | 5.40 | -1.82% |
| 2006 | 5.00 | -7.41% |
| 2007 | 2.80 | -44.00% |
| 2008 | 3.80 | 35.71% |
| 2009 | 5.20 | 36.84% |
| 2010 | 7.70 | 48.08% |
| 2011 | 4.00 | -48.05% |
| 2012 | 4.70 | 17.50% |
| 2013 | 7.00 | 48.94% |
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