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| year | production | change |
| 1986 | .90 | NA |
| 1987 | 1.40 | 55.56% |
| 1988 | .90 | -35.71% |
| 1989 | 1.60 | 77.78% |
| 1990 | 1.90 | 18.75% |
| 1991 | 2.50 | 31.58% |
| 1992 | 2.50 | 0.00% |
| 1993 | 2.10 | -16.00% |
| 1994 | 2.00 | -4.76% |
| 1995 | 3.30 | 65.00% |
| 1996 | 3.30 | 0.00% |
| 1997 | .80 | -75.76% |
| 1998 | .80 | 0.00% |
| 1999 | .70 | -12.50% |
| 2000 | .80 | 14.29% |
| 2001 | .80 | 0.00% |
| 2002 | .80 | 0.00% |
| 2003 | 2.90 | 262.50% |
| 2004 | 2.90 | 0.00% |
| 2005 | 3.10 | 6.90% |
| 2006 | 23.00 | 641.94% |
| 2007 | 2.30 | -90.00% |
| 2008 | 2.10 | -8.70% |
| 2009 | 2.30 | 9.52% |
| 2010 | 2.20 | -4.35% |
| 2011 | 1.70 | -22.73% |
| 2012 | 1.90 | 11.76% |
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