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| year | production | change |
| 1980 | .30 | NA |
| 1981 | .00 | -100.00% |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 4.60 | NA |
| 1985 | 4.20 | -8.70% |
| 1986 | 5.10 | 21.43% |
| 1987 | 5.10 | 0.00% |
| 1988 | 4.80 | -5.88% |
| 1989 | 4.50 | -6.25% |
| 1990 | 4.50 | 0.00% |
| 1991 | 4.60 | 2.22% |
| 1992 | 4.10 | -10.87% |
| 1993 | 4.20 | 2.44% |
| 1994 | 4.60 | 9.52% |
| 1995 | 4.70 | 2.17% |
| 1996 | 5.10 | 8.51% |
| 1997 | 5.90 | 15.69% |
| 1998 | 4.30 | -27.12% |
| 1999 | 5.10 | 18.60% |
| 2000 | 5.60 | 9.80% |
| 2001 | 5.30 | -5.36% |
| 2002 | 5.10 | -3.77% |
| 2003 | 5.30 | 3.92% |
| 2004 | 5.10 | -3.77% |
| 2005 | 4.70 | -7.84% |
| 2006 | 5.20 | 10.64% |
| 2007 | 5.10 | -1.92% |
| 2008 | 3.60 | -29.41% |
| 2009 | 4.40 | 22.22% |
| 2010 | 4.80 | 9.09% |
| 2011 | 4.20 | -12.50% |
| 2012 | 5.10 | 21.43% |
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