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| year | production | change |
| 1980 | .41 | NA |
| 1981 | .41 | -0.49% |
| 1982 | .40 | -2.44% |
| 1983 | .41 | 3.51% |
| 1984 | .43 | 3.15% |
| 1985 | .44 | 3.05% |
| 1986 | .48 | 8.43% |
| 1987 | .57 | 19.54% |
| 1988 | .65 | 13.36% |
| 1989 | .83 | 28.68% |
| 1990 | 1.00 | 20.72% |
| 1991 | 1.26 | 25.35% |
| 1992 | 1.24 | -1.59% |
| 1993 | 1.41 | 14.08% |
| 1994 | 1.43 | 1.13% |
| 1995 | 1.44 | 0.84% |
| 1996 | 1.51 | 5.08% |
| 1997 | 1.48 | -2.12% |
| 1998 | 1.50 | 1.56% |
| 1999 | 1.48 | -1.46% |
| 2000 | 1.46 | -1.22% |
| 2001 | 1.37 | -6.57% |
| 2002 | 1.42 | 4.03% |
| 2003 | 1.40 | -1.34% |
| 2004 | 1.38 | -1.57% |
| 2005 | 1.29 | -6.74% |
| 2006 | 1.23 | -4.43% |
| 2007 | 1.16 | -5.85% |
| 2008 | 1.13 | -2.76% |
| 2009 | 1.13 | 0.62% |
| 2010 | 1.26 | 11.56% |
| 2011 | 1.13 | -10.68% |
| 2012 | .64 | -43.67% |
| 2013 | .38 | -40.09% |
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