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Loading...
| year | production | change |
| 1980 | .00 | NA |
| 1981 | .00 | NA |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | .00 | NA |
| 1985 | .00 | NA |
| 1986 | .00 | NA |
| 1987 | .00 | NA |
| 1988 | .00 | NA |
| 1989 | .00 | NA |
| 1990 | .00 | NA |
| 1991 | .00 | NA |
| 1992 | 3.70 | NA |
| 1993 | 3.80 | 2.70% |
| 1994 | 4.30 | 13.16% |
| 1995 | 3.90 | -9.30% |
| 1996 | 3.00 | -23.08% |
| 1997 | 4.40 | 46.67% |
| 1998 | 4.40 | 0.00% |
| 1999 | 4.00 | -9.09% |
| 2000 | 4.00 | 0.00% |
| 2001 | 4.20 | 5.00% |
| 2002 | 3.90 | -7.14% |
| 2003 | 3.90 | 0.00% |
| 2004 | 4.60 | 17.95% |
| 2005 | 4.80 | 4.35% |
| 2006 | 4.70 | -2.08% |
| 2007 | 4.60 | -2.13% |
| 2008 | 5.10 | 10.87% |
| 2009 | 5.40 | 5.88% |
| 2010 | 6.40 | 18.52% |
| 2011 | 5.90 | -7.81% |
| 2012 | 6.00 | 1.69% |
| 2013 | 6.00 | 0.00% |
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