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| year | production | change |
| 1980 | .09 | NA |
| 1981 | .08 | -4.65% |
| 1982 | .09 | 13.41% |
| 1983 | .10 | 4.30% |
| 1984 | .11 | 10.31% |
| 1985 | .11 | 0.00% |
| 1986 | .11 | -1.87% |
| 1987 | .09 | -13.33% |
| 1988 | .08 | -13.19% |
| 1989 | .09 | 11.39% |
| 1990 | .08 | -5.68% |
| 1991 | .09 | 3.61% |
| 1992 | .09 | 0.00% |
| 1993 | .09 | 4.65% |
| 1994 | .10 | 12.22% |
| 1995 | .10 | -0.99% |
| 1996 | .10 | -5.00% |
| 1997 | .09 | -1.05% |
| 1998 | .10 | 7.45% |
| 1999 | .09 | -11.88% |
| 2000 | .17 | 87.64% |
| 2001 | .28 | 65.87% |
| 2002 | .38 | 37.18% |
| 2003 | .43 | 14.21% |
| 2004 | .46 | 5.76% |
| 2005 | .57 | 24.40% |
| 2006 | .57 | -0.35% |
| 2007 | .60 | 6.15% |
| 2008 | .56 | -6.62% |
| 2009 | .54 | -5.14% |
| 2010 | .56 | 4.67% |
| 2011 | .58 | 3.04% |
| 2012 | .59 | 2.95% |
| 2013 | .63 | 5.89% |
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