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| year | production | change |
| 1980 | .10 | NA |
| 1981 | .00 | -100.00% |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 4.60 | NA |
| 1985 | 7.50 | 63.04% |
| 1986 | 9.00 | 20.00% |
| 1987 | 5.40 | -40.00% |
| 1988 | 5.40 | 0.00% |
| 1989 | 4.30 | -20.37% |
| 1990 | 4.40 | 2.33% |
| 1991 | 6.20 | 40.91% |
| 1992 | 5.40 | -12.90% |
| 1993 | 6.00 | 11.11% |
| 1994 | 6.00 | 0.00% |
| 1995 | 5.40 | -10.00% |
| 1996 | 6.60 | 22.22% |
| 1997 | 7.00 | 6.06% |
| 1998 | 8.00 | 14.29% |
| 1999 | 7.10 | -11.25% |
| 2000 | 6.10 | -14.08% |
| 2001 | 5.80 | -4.92% |
| 2002 | 6.70 | 15.52% |
| 2003 | 5.60 | -16.42% |
| 2004 | 6.10 | 8.93% |
| 2005 | 6.30 | 3.28% |
| 2006 | 7.10 | 12.70% |
| 2007 | 6.50 | -8.45% |
| 2008 | 7.60 | 16.92% |
| 2009 | 6.50 | -14.47% |
| 2010 | 5.40 | -16.92% |
| 2011 | 5.90 | 9.26% |
| 2012 | 3.70 | -37.29% |
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