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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .03 | 8.70% |
| 1982 | .03 | 0.00% |
| 1983 | .03 | 0.00% |
| 1984 | .03 | 0.00% |
| 1985 | .03 | 12.00% |
| 1986 | .03 | 14.29% |
| 1987 | .04 | 18.75% |
| 1988 | .04 | 10.53% |
| 1989 | .05 | 11.90% |
| 1990 | .05 | 10.64% |
| 1991 | .06 | 7.69% |
| 1992 | .06 | 5.36% |
| 1993 | .06 | 3.39% |
| 1994 | .07 | 8.20% |
| 1995 | .09 | 34.85% |
| 1996 | .10 | 6.74% |
| 1997 | .10 | 5.26% |
| 1998 | .10 | 0.00% |
| 1999 | .10 | 0.00% |
| 2000 | .10 | 0.00% |
| 2001 | .10 | 0.00% |
| 2002 | .10 | 0.00% |
| 2003 | .20 | 100.00% |
| 2004 | .20 | 0.00% |
| 2005 | .10 | -50.00% |
| 2006 | .20 | 100.00% |
| 2007 | .20 | 0.00% |
| 2008 | .20 | 0.00% |
| 2009 | .20 | 0.00% |
| 2010 | .20 | 0.00% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
| 2013 | .20 | 0.00% |
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