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| year | production | change |
| 1980 | .01 | NA |
| 1981 | .03 | 138.46% |
| 1982 | .07 | 135.48% |
| 1983 | .10 | 31.51% |
| 1984 | .11 | 12.50% |
| 1985 | .17 | 55.56% |
| 1986 | .24 | 42.26% |
| 1987 | .31 | 27.62% |
| 1988 | .31 | 1.97% |
| 1989 | .37 | 18.01% |
| 1990 | .38 | 4.09% |
| 1991 | .46 | 20.68% |
| 1992 | .51 | 11.50% |
| 1993 | .56 | 8.17% |
| 1994 | .60 | 7.01% |
| 1995 | .62 | 3.36% |
| 1996 | .71 | 15.28% |
| 1997 | .82 | 15.23% |
| 1998 | .84 | 2.82% |
| 1999 | .98 | 16.90% |
| 2000 | 1.15 | 16.60% |
| 2001 | 1.12 | -2.36% |
| 2002 | 1.18 | 5.46% |
| 2003 | 1.18 | 0.42% |
| 2004 | 1.29 | 8.53% |
| 2005 | 1.30 | 1.25% |
| 2006 | 1.22 | -6.30% |
| 2007 | 1.12 | -8.12% |
| 2008 | 1.09 | -2.50% |
| 2009 | .97 | -11.36% |
| 2010 | .95 | -1.55% |
| 2011 | .86 | -10.18% |
| 2012 | .79 | -7.83% |
| 2013 | .71 | -9.51% |
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