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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .02 | 9.09% |
| 1982 | .03 | 4.17% |
| 1983 | .03 | 20.00% |
| 1984 | .03 | 3.33% |
| 1985 | .03 | -6.45% |
| 1986 | .03 | 3.45% |
| 1987 | .03 | 3.33% |
| 1988 | .03 | 0.00% |
| 1989 | .03 | 9.68% |
| 1990 | .04 | 2.94% |
| 1991 | .04 | 8.57% |
| 1992 | .04 | 10.53% |
| 1993 | .05 | 7.14% |
| 1994 | .05 | 0.00% |
| 1995 | .04 | -8.89% |
| 1996 | .05 | 9.76% |
| 1997 | .06 | 22.22% |
| 1998 | .05 | -9.09% |
| 1999 | .06 | 22.00% |
| 2000 | .07 | 13.11% |
| 2001 | .07 | 1.45% |
| 2002 | .07 | 5.71% |
| 2003 | .07 | -2.70% |
| 2004 | .08 | 9.72% |
| 2005 | .08 | 0.00% |
| 2006 | .08 | 1.27% |
| 2007 | .08 | 2.50% |
| 2008 | .09 | 4.88% |
| 2009 | .09 | 0.00% |
| 2010 | .09 | 1.16% |
| 2011 | .09 | -1.15% |
| 2012 | .09 | 2.33% |
| 2013 | .08 | -4.55% |
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