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| year | production | change |
| 1980 | 10.00 | NA |
| 1981 | 7.00 | -30.00% |
| 1982 | 7.00 | 0.00% |
| 1983 | 7.00 | 0.00% |
| 1984 | 7.20 | 2.86% |
| 1985 | 9.70 | 34.72% |
| 1986 | 6.40 | -34.02% |
| 1987 | 8.50 | 32.81% |
| 1988 | 11.00 | 29.41% |
| 1989 | 7.50 | -31.82% |
| 1990 | 3.60 | -52.00% |
| 1991 | 3.40 | -5.56% |
| 1992 | 3.20 | -5.88% |
| 1993 | 3.60 | 12.50% |
| 1994 | 2.50 | -30.56% |
| 1995 | 1.90 | -24.00% |
| 1996 | 2.20 | 15.79% |
| 1997 | 1.60 | -27.27% |
| 1998 | 1.90 | 18.75% |
| 1999 | 1.00 | -47.37% |
| 2000 | .70 | -30.00% |
| 2001 | .70 | 0.00% |
| 2002 | 1.00 | 42.86% |
| 2003 | 1.70 | 70.00% |
| 2004 | 1.40 | -17.65% |
| 2005 | .50 | -64.29% |
| 2006 | .70 | 40.00% |
| 2007 | 1.50 | 114.29% |
| 2008 | .30 | -80.00% |
| 2009 | .50 | 66.67% |
| 2010 | .80 | 60.00% |
| 2011 | 1.30 | 62.50% |
| 2012 | 1.00 | -23.08% |
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