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| year | production | change |
| 1980 | .01 | NA |
| 1981 | .02 | 33.33% |
| 1982 | .02 | 6.25% |
| 1983 | .02 | 17.65% |
| 1984 | .02 | -5.00% |
| 1985 | .02 | 15.79% |
| 1986 | .02 | 4.55% |
| 1987 | .02 | 4.35% |
| 1988 | .03 | 20.83% |
| 1989 | .03 | 6.90% |
| 1990 | .03 | 3.23% |
| 1991 | .03 | 6.25% |
| 1992 | .03 | 0.00% |
| 1993 | .04 | 5.88% |
| 1994 | .04 | -2.78% |
| 1995 | .04 | 8.57% |
| 1996 | .04 | 5.26% |
| 1997 | .04 | -5.00% |
| 1998 | .04 | 0.00% |
| 1999 | .03 | -21.05% |
| 2000 | .02 | -30.00% |
| 2001 | .03 | 57.14% |
| 2002 | .04 | 18.18% |
| 2003 | .04 | 12.82% |
| 2004 | .04 | -4.55% |
| 2005 | .04 | 2.38% |
| 2006 | .05 | 4.65% |
| 2007 | .05 | 4.44% |
| 2008 | .04 | -12.77% |
| 2009 | .04 | -12.20% |
| 2010 | .05 | 36.11% |
| 2011 | .05 | 2.04% |
| 2012 | .06 | 16.00% |
| 2013 | .06 | -3.45% |
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