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| year | production | change |
| 1980 | .07 | NA |
| 1981 | .09 | 27.40% |
| 1982 | .10 | 3.23% |
| 1983 | .10 | 4.17% |
| 1984 | .10 | 0.00% |
| 1985 | .12 | 22.00% |
| 1986 | .12 | -0.82% |
| 1987 | .12 | -4.13% |
| 1988 | .12 | 5.17% |
| 1989 | .12 | -1.64% |
| 1990 | .02 | -81.67% |
| 1991 | .02 | -9.09% |
| 1992 | .02 | -20.00% |
| 1993 | .02 | 0.00% |
| 1994 | .02 | 0.00% |
| 1995 | .01 | -25.00% |
| 1996 | .01 | 0.00% |
| 1997 | .01 | 0.00% |
| 1998 | .01 | 0.00% |
| 1999 | .01 | 0.00% |
| 2000 | .01 | 0.00% |
| 2001 | .01 | -33.33% |
| 2002 | .01 | 0.00% |
| 2003 | .01 | 0.00% |
| 2004 | .01 | -12.50% |
| 2005 | .01 | 0.00% |
| 2006 | .01 | 14.29% |
| 2007 | .02 | 87.50% |
| 2008 | .02 | 6.67% |
| 2009 | .02 | 31.25% |
| 2010 | .03 | 47.62% |
| 2011 | .04 | 41.94% |
| 2012 | .04 | 0.00% |
| 2013 | .01 | -68.18% |
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