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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .02 | 25.00% |
| 1982 | .02 | 10.00% |
| 1983 | .02 | 0.00% |
| 1984 | .02 | -9.09% |
| 1985 | .01 | -45.00% |
| 1986 | .30 | 2,627.27% |
| 1987 | 1.20 | 300.00% |
| 1988 | 1.50 | 25.00% |
| 1989 | 1.50 | 0.00% |
| 1990 | 1.50 | 0.00% |
| 1991 | 1.60 | 6.67% |
| 1992 | 1.60 | 0.00% |
| 1993 | 1.60 | 0.00% |
| 1994 | 1.70 | 6.25% |
| 1995 | 1.70 | 0.00% |
| 1996 | 1.90 | 11.76% |
| 1997 | 1.80 | -5.26% |
| 1998 | 1.80 | 0.00% |
| 1999 | 1.80 | 0.00% |
| 2000 | 1.80 | 0.00% |
| 2001 | 1.90 | 5.56% |
| 2002 | 2.20 | 15.79% |
| 2003 | 2.50 | 13.64% |
| 2004 | 2.30 | -8.00% |
| 2005 | 2.60 | 13.04% |
| 2006 | 4.50 | 73.08% |
| 2007 | 6.50 | 44.44% |
| 2008 | 6.90 | 6.15% |
| 2009 | 6.90 | 0.00% |
| 2010 | 7.30 | 5.80% |
| 2011 | 7.00 | -4.11% |
| 2012 | 6.70 | -4.29% |
| 2013 | 7.50 | 11.94% |
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