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| year | production | change |
| 1980 | .04 | NA |
| 1981 | .06 | 39.53% |
| 1982 | .08 | 38.33% |
| 1983 | .09 | 6.02% |
| 1984 | .09 | 4.55% |
| 1985 | .10 | 6.52% |
| 1986 | .07 | -27.55% |
| 1987 | .07 | -4.23% |
| 1988 | .08 | 20.59% |
| 1989 | .09 | 9.76% |
| 1990 | .09 | 1.11% |
| 1991 | .09 | 2.20% |
| 1992 | .09 | -1.08% |
| 1993 | .10 | 11.96% |
| 1994 | .11 | 2.91% |
| 1995 | .11 | 0.94% |
| 1996 | .10 | -3.74% |
| 1997 | .09 | -10.68% |
| 1998 | .07 | -19.57% |
| 1999 | .06 | -18.92% |
| 2000 | .06 | -6.67% |
| 2001 | .04 | -28.57% |
| 2002 | .04 | 10.00% |
| 2003 | .04 | -18.18% |
| 2004 | .04 | 22.22% |
| 2005 | .04 | -11.36% |
| 2006 | .04 | 10.26% |
| 2007 | .04 | 2.33% |
| 2008 | .05 | 15.91% |
| 2009 | .05 | 5.88% |
| 2010 | .05 | -12.96% |
| 2011 | .06 | 27.66% |
| 2012 | .06 | -3.33% |
| 2013 | .06 | 3.45% |
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