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| year | production | change |
| 1980 | .50 | NA |
| 1981 | .00 | -100.00% |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 4.60 | NA |
| 1985 | 5.00 | 8.70% |
| 1986 | 5.60 | 12.00% |
| 1987 | 6.40 | 14.29% |
| 1988 | 8.70 | 35.94% |
| 1989 | 6.00 | -31.03% |
| 1990 | 4.20 | -30.00% |
| 1991 | 6.70 | 59.52% |
| 1992 | 8.60 | 28.36% |
| 1993 | 8.90 | 3.49% |
| 1994 | 9.30 | 4.49% |
| 1995 | 7.20 | -22.58% |
| 1996 | 10.00 | 38.89% |
| 1997 | 9.50 | -5.00% |
| 1998 | 11.00 | 15.79% |
| 1999 | 6.50 | -40.91% |
| 2000 | 6.90 | 6.15% |
| 2001 | 4.90 | -28.99% |
| 2002 | 7.30 | 48.98% |
| 2003 | 8.60 | 17.81% |
| 2004 | 8.50 | -1.16% |
| 2005 | 9.90 | 16.47% |
| 2006 | 13.00 | 31.31% |
| 2007 | 11.00 | -15.38% |
| 2008 | 11.00 | 0.00% |
| 2009 | 8.70 | -20.91% |
| 2010 | 7.80 | -10.34% |
| 2011 | 12.00 | 53.85% |
| 2012 | 8.10 | -32.50% |
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