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| year | production | change |
| 1980 | 14.00 | NA |
| 1981 | 3.50 | -75.00% |
| 1982 | 3.10 | -11.43% |
| 1983 | 5.20 | 67.74% |
| 1984 | .70 | -86.54% |
| 1985 | .30 | -57.14% |
| 1986 | .20 | -33.33% |
| 1987 | .20 | 0.00% |
| 1988 | .20 | 0.00% |
| 1989 | .20 | 0.00% |
| 1990 | .40 | 100.00% |
| 1991 | .50 | 25.00% |
| 1992 | .40 | -20.00% |
| 1993 | .40 | 0.00% |
| 1994 | .40 | 0.00% |
| 1995 | .40 | 0.00% |
| 1996 | .50 | 25.00% |
| 1997 | 1.00 | 100.00% |
| 1998 | 1.50 | 50.00% |
| 1999 | 7.60 | 406.67% |
| 2000 | 9.60 | 26.32% |
| 2001 | 12.00 | 25.00% |
| 2002 | 13.00 | 8.33% |
| 2003 | 11.00 | -15.38% |
| 2004 | 12.00 | 9.09% |
| 2005 | 13.00 | 8.33% |
| 2006 | 15.00 | 15.38% |
| 2007 | 16.00 | 6.67% |
| 2008 | 15.00 | -6.25% |
| 2009 | 17.00 | 13.33% |
| 2010 | 16.00 | -5.88% |
| 2011 | 17.00 | 6.25% |
| 2012 | 15.00 | -11.76% |
| 2013 | 15.00 | 0.00% |
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