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| year | production | change |
| 1980 | .01 | NA |
| 1981 | .02 | 50.00% |
| 1982 | .01 | -13.33% |
| 1983 | .01 | -23.08% |
| 1984 | .02 | 70.00% |
| 1985 | .02 | 23.53% |
| 1986 | .02 | 9.52% |
| 1987 | .02 | -4.35% |
| 1988 | .02 | 9.09% |
| 1989 | .02 | -4.17% |
| 1990 | .02 | 0.00% |
| 1991 | .02 | -8.70% |
| 1992 | .02 | -4.76% |
| 1993 | .02 | 20.00% |
| 1994 | .03 | 4.17% |
| 1995 | .03 | 0.00% |
| 1996 | .03 | 24.00% |
| 1997 | .03 | -3.23% |
| 1998 | .02 | -26.67% |
| 1999 | .03 | 45.45% |
| 2000 | .04 | 9.38% |
| 2001 | .03 | -25.71% |
| 2002 | .03 | 30.77% |
| 2003 | .03 | -14.71% |
| 2004 | .04 | 31.03% |
| 2005 | .04 | -2.63% |
| 2006 | .04 | -2.70% |
| 2007 | .04 | 2.78% |
| 2008 | .04 | 5.41% |
| 2009 | .04 | -2.56% |
| 2010 | .04 | 7.89% |
| 2011 | .04 | -2.44% |
| 2012 | .05 | 27.50% |
| 2013 | .06 | 19.61% |
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