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| year | production | change |
| 1981 | .00 | NA |
| 1982 | .00 | NA |
| 1983 | .00 | NA |
| 1984 | 2.40 | NA |
| 1985 | 2.90 | 20.83% |
| 1986 | 2.00 | -31.03% |
| 1987 | 2.40 | 20.00% |
| 1988 | 1.40 | -41.67% |
| 1989 | 1.30 | -7.14% |
| 1990 | 1.50 | 15.38% |
| 1991 | 1.30 | -13.33% |
| 1992 | .60 | -53.85% |
| 1993 | .60 | 0.00% |
| 1994 | 1.10 | 83.33% |
| 1995 | 1.90 | 72.73% |
| 1996 | .60 | -68.42% |
| 1997 | 1.40 | 133.33% |
| 1998 | .90 | -35.71% |
| 1999 | .60 | -33.33% |
| 2000 | 1.20 | 100.00% |
| 2001 | .10 | -91.67% |
| 2002 | .90 | 800.00% |
| 2003 | 1.60 | 77.78% |
| 2004 | 1.80 | 12.50% |
| 2005 | 3.40 | 88.89% |
| 2006 | 1.60 | -52.94% |
| 2007 | 2.30 | 43.75% |
| 2008 | 3.10 | 34.78% |
| 2009 | 2.90 | -6.45% |
| 2010 | 2.80 | -3.45% |
| 2011 | 3.20 | 14.29% |
| 2012 | 2.20 | -31.25% |
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