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| year | production | change |
| 1980 | .80 | NA |
| 1981 | .00 | -100.00% |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 5.20 | NA |
| 1985 | 5.80 | 11.54% |
| 1986 | 7.50 | 29.31% |
| 1987 | 6.70 | -10.67% |
| 1988 | 5.40 | -19.40% |
| 1989 | 5.10 | -5.56% |
| 1990 | 7.00 | 37.25% |
| 1991 | 8.10 | 15.71% |
| 1992 | 9.30 | 14.81% |
| 1993 | 9.50 | 2.15% |
| 1994 | 8.70 | -8.42% |
| 1995 | 7.30 | -16.09% |
| 1996 | 8.30 | 13.70% |
| 1997 | 8.60 | 3.61% |
| 1998 | 9.30 | 8.14% |
| 1999 | 8.50 | -8.60% |
| 2000 | 9.90 | 16.47% |
| 2001 | 8.90 | -10.10% |
| 2002 | 8.70 | -2.25% |
| 2003 | 11.00 | 26.44% |
| 2004 | 13.00 | 18.18% |
| 2005 | 14.00 | 7.69% |
| 2006 | 9.60 | -31.43% |
| 2007 | 8.40 | -12.50% |
| 2008 | 11.00 | 30.95% |
| 2009 | 8.90 | -19.09% |
| 2010 | 11.00 | 23.60% |
| 2011 | 8.60 | -21.82% |
| 2012 | 12.00 | 39.53% |
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