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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .03 | 106.25% |
| 1982 | .04 | 12.12% |
| 1983 | .06 | 64.86% |
| 1984 | .06 | 1.64% |
| 1985 | .07 | 19.35% |
| 1986 | .06 | -25.68% |
| 1987 | .05 | -7.27% |
| 1988 | .04 | -23.53% |
| 1989 | .02 | -56.41% |
| 1990 | .02 | 5.88% |
| 1991 | .02 | -5.56% |
| 1992 | .01 | -17.65% |
| 1993 | .01 | -14.29% |
| 1994 | .03 | 125.00% |
| 1995 | .04 | 37.04% |
| 1996 | .07 | 97.30% |
| 1997 | .08 | 12.33% |
| 1998 | .09 | 6.10% |
| 1999 | .10 | 14.94% |
| 2000 | .09 | -7.00% |
| 2001 | .09 | -1.08% |
| 2002 | .09 | -1.09% |
| 2003 | .11 | 17.58% |
| 2004 | .12 | 13.08% |
| 2005 | .15 | 19.83% |
| 2006 | .20 | 34.48% |
| 2007 | .18 | -5.64% |
| 2008 | .20 | 10.87% |
| 2009 | .20 | -0.98% |
| 2010 | .16 | -18.81% |
| 2011 | .16 | -4.88% |
| 2012 | .16 | 3.85% |
| 2013 | .16 | -1.23% |
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