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| year | production | change |
| 1980 | .04 | NA |
| 1981 | .04 | -7.69% |
| 1982 | .03 | -11.11% |
| 1983 | .03 | 0.00% |
| 1984 | .03 | 0.00% |
| 1985 | .03 | 0.00% |
| 1986 | .03 | 3.13% |
| 1987 | .03 | -9.09% |
| 1988 | .03 | 3.33% |
| 1989 | .03 | -6.45% |
| 1990 | .03 | 3.45% |
| 1991 | .03 | 3.33% |
| 1992 | .03 | -9.68% |
| 1993 | .02 | -17.86% |
| 1994 | .03 | 21.74% |
| 1995 | .03 | -7.14% |
| 1996 | .04 | 38.46% |
| 1997 | .03 | -5.56% |
| 1998 | .02 | -29.41% |
| 1999 | .01 | -41.67% |
| 2000 | .01 | -21.43% |
| 2001 | .01 | 27.27% |
| 2002 | .01 | -7.14% |
| 2003 | .02 | 46.15% |
| 2004 | .02 | 10.53% |
| 2005 | .02 | -28.57% |
| 2006 | .02 | 0.00% |
| 2007 | .01 | -6.67% |
| 2008 | .02 | 7.14% |
| 2009 | .03 | 113.33% |
| 2010 | .04 | 34.38% |
| 2011 | .03 | -27.91% |
| 2012 | .03 | -16.13% |
| 2013 | .04 | 69.23% |
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