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| year | production | change |
| 1980 | .03 | NA |
| 1981 | .03 | 0.00% |
| 1982 | .03 | 0.00% |
| 1983 | .03 | 0.00% |
| 1984 | .04 | 33.33% |
| 1985 | .03 | -25.00% |
| 1986 | .03 | 0.00% |
| 1987 | .04 | 33.33% |
| 1988 | .04 | 0.00% |
| 1989 | .04 | 0.00% |
| 1990 | .03 | -25.00% |
| 1991 | .04 | 33.33% |
| 1992 | .03 | -25.00% |
| 1993 | .04 | 33.33% |
| 1994 | .04 | 0.00% |
| 1995 | .05 | 25.00% |
| 1996 | .04 | -20.00% |
| 1997 | .05 | 25.00% |
| 1998 | .05 | 0.00% |
| 1999 | .07 | 40.00% |
| 2000 | .08 | 14.29% |
| 2001 | .08 | 0.00% |
| 2002 | .08 | 0.00% |
| 2003 | .09 | 12.50% |
| 2004 | .12 | 33.33% |
| 2005 | .14 | 16.67% |
| 2006 | .16 | 14.29% |
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