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| year | production | change |
| 1980 | .30 | NA |
| 1981 | .00 | -100.00% |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 8.10 | NA |
| 1985 | 7.80 | -3.70% |
| 1986 | 9.10 | 16.67% |
| 1987 | 8.10 | -10.99% |
| 1988 | 9.40 | 16.05% |
| 1989 | 11.00 | 17.02% |
| 1990 | 12.00 | 9.09% |
| 1991 | 10.00 | -16.67% |
| 1992 | 12.00 | 20.00% |
| 1993 | 11.00 | -8.33% |
| 1994 | 16.00 | 45.45% |
| 1995 | 13.00 | -18.75% |
| 1996 | 12.00 | -7.69% |
| 1997 | 12.00 | 0.00% |
| 1998 | 13.00 | 8.33% |
| 1999 | 11.00 | -15.38% |
| 2000 | 8.70 | -20.91% |
| 2001 | 12.00 | 37.93% |
| 2002 | 11.00 | -8.33% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 13.00 | 8.33% |
| 2007 | 11.00 | -15.38% |
| 2008 | 12.00 | 9.09% |
| 2009 | 9.90 | -17.50% |
| 2010 | 11.00 | 11.11% |
| 2011 | 8.80 | -20.00% |
| 2012 | 7.00 | -20.45% |
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