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| year | production | change |
| 1980 | 1.00 | NA |
| 1981 | 2.00 | 100.00% |
| 1982 | 1.00 | -50.00% |
| 1983 | 1.00 | 0.00% |
| 1984 | .20 | -80.00% |
| 1985 | .50 | 150.00% |
| 1986 | 1.60 | 220.00% |
| 1987 | .90 | -43.75% |
| 1988 | 1.70 | 88.89% |
| 1989 | 1.30 | -23.53% |
| 1990 | 1.70 | 30.77% |
| 1991 | 1.90 | 11.76% |
| 1992 | 1.60 | -15.79% |
| 1993 | .30 | -81.25% |
| 1994 | 1.80 | 500.00% |
| 1995 | 1.90 | 5.56% |
| 1996 | 2.20 | 15.79% |
| 1997 | 2.40 | 9.09% |
| 1998 | 2.70 | 12.50% |
| 1999 | 2.10 | -22.22% |
| 2000 | 1.90 | -9.52% |
| 2001 | 2.50 | 31.58% |
| 2002 | 1.70 | -32.00% |
| 2003 | 1.40 | -17.65% |
| 2004 | 1.70 | 21.43% |
| 2005 | 1.40 | -17.65% |
| 2006 | .90 | -35.71% |
| 2007 | .70 | -22.22% |
| 2008 | .80 | 14.29% |
| 2009 | 1.30 | 62.50% |
| 2010 | 1.40 | 7.69% |
| 2011 | 1.40 | 0.00% |
| 2012 | 1.40 | 0.00% |
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