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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .02 | -11.76% |
| 1982 | .02 | 26.67% |
| 1983 | .02 | 26.32% |
| 1984 | .02 | -25.00% |
| 1985 | .01 | -22.22% |
| 1986 | .03 | 107.14% |
| 1987 | .03 | -6.90% |
| 1988 | .03 | -3.70% |
| 1989 | .03 | 19.23% |
| 1990 | .03 | 9.68% |
| 1991 | .04 | 2.94% |
| 1992 | .03 | -5.71% |
| 1993 | .04 | 18.18% |
| 1994 | .04 | 10.26% |
| 1995 | .05 | 4.65% |
| 1996 | .05 | 15.56% |
| 1997 | .06 | 11.54% |
| 1998 | .07 | 27.59% |
| 1999 | .08 | 10.81% |
| 2000 | .08 | -3.66% |
| 2001 | .08 | -3.80% |
| 2002 | .07 | -11.84% |
| 2003 | .09 | 35.82% |
| 2004 | .09 | -6.59% |
| 2005 | .08 | -5.88% |
| 2006 | .09 | 11.25% |
| 2007 | .08 | -8.99% |
| 2008 | .08 | 0.00% |
| 2009 | .07 | -11.11% |
| 2010 | .08 | 12.50% |
| 2011 | .08 | 0.00% |
| 2012 | .08 | 1.23% |
| 2013 | .09 | 3.66% |
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