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| year | production | change |
| 1980 | .01 | NA |
| 1981 | .01 | 0.00% |
| 1982 | .01 | 22.22% |
| 1983 | .01 | -27.27% |
| 1984 | .01 | 12.50% |
| 1985 | .01 | 33.33% |
| 1986 | .01 | 8.33% |
| 1987 | .01 | -38.46% |
| 1988 | .01 | 50.00% |
| 1989 | .02 | 75.00% |
| 1990 | .02 | 0.00% |
| 1991 | .02 | 9.52% |
| 1992 | .03 | 13.04% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 11.54% |
| 1995 | .03 | 0.00% |
| 1996 | .03 | 6.90% |
| 1997 | .03 | -19.35% |
| 1998 | .03 | 16.00% |
| 1999 | .04 | 24.14% |
| 2000 | .03 | -16.67% |
| 2001 | .03 | 3.33% |
| 2002 | .03 | 0.00% |
| 2003 | .03 | 0.00% |
| 2004 | .03 | 0.00% |
| 2005 | .03 | 0.00% |
| 2006 | .04 | 12.90% |
| 2007 | .04 | 14.29% |
| 2008 | .05 | 12.50% |
| 2009 | .05 | 0.00% |
| 2010 | .04 | -2.22% |
| 2011 | .04 | 0.00% |
| 2012 | .04 | -4.55% |
| 2013 | .04 | -4.76% |
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