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| year | production | change |
| 1980 | 5.00 | NA |
| 1981 | 3.00 | -40.00% |
| 1982 | 3.00 | 0.00% |
| 1983 | 3.00 | 0.00% |
| 1984 | 3.00 | 0.00% |
| 1985 | 2.00 | -33.33% |
| 1986 | 2.00 | 0.00% |
| 1987 | 3.00 | 50.00% |
| 1988 | 2.00 | -33.33% |
| 1989 | 2.00 | 0.00% |
| 1990 | 3.00 | 50.00% |
| 1991 | 2.20 | -26.67% |
| 1992 | 2.00 | -9.09% |
| 1993 | 1.10 | -45.00% |
| 1994 | 1.30 | 18.18% |
| 1995 | 1.20 | -7.69% |
| 1996 | 1.20 | 0.00% |
| 1997 | 1.00 | -16.67% |
| 1998 | .90 | -10.00% |
| 1999 | .80 | -11.11% |
| 2000 | .70 | -12.50% |
| 2001 | .80 | 14.29% |
| 2002 | .90 | 12.50% |
| 2003 | .90 | 0.00% |
| 2004 | .80 | -11.11% |
| 2005 | .60 | -25.00% |
| 2006 | .40 | -33.33% |
| 2007 | .30 | -25.00% |
| 2008 | .30 | 0.00% |
| 2009 | .30 | 0.00% |
| 2010 | .20 | -33.33% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
| 2013 | .20 | 0.00% |
| 2014 | .20 | 0.00% |
| 2015 | .20 | 0.00% |
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