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| year | production | change |
| 1980 | .16 | NA |
| 1981 | .16 | 1.28% |
| 1982 | .21 | 30.38% |
| 1983 | .23 | 13.59% |
| 1984 | .19 | -18.38% |
| 1985 | .19 | 0.52% |
| 1986 | .20 | 2.60% |
| 1987 | .20 | 2.54% |
| 1988 | .19 | -7.92% |
| 1989 | .20 | 4.84% |
| 1990 | .13 | -34.87% |
| 1991 | .10 | -25.20% |
| 1992 | .06 | -32.63% |
| 1993 | .06 | -1.56% |
| 1994 | .07 | 7.94% |
| 1995 | .07 | 0.00% |
| 1996 | .08 | 22.06% |
| 1997 | .07 | -12.05% |
| 1998 | .07 | -9.59% |
| 1999 | .07 | 3.03% |
| 2000 | .06 | -10.29% |
| 2001 | .05 | -16.39% |
| 2002 | .05 | 0.00% |
| 2003 | .07 | 35.29% |
| 2004 | .07 | 2.90% |
| 2005 | .07 | 0.00% |
| 2006 | .07 | -4.23% |
| 2007 | .04 | -36.76% |
| 2008 | .05 | 23.26% |
| 2009 | .06 | 20.75% |
| 2010 | .10 | 56.25% |
| 2011 | .08 | -25.00% |
| 2012 | .08 | 12.00% |
| 2013 | .11 | 26.19% |
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