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| year | production | change |
| 1980 | 3.00 | NA |
| 1981 | 8.00 | 166.67% |
| 1982 | 7.00 | -12.50% |
| 1983 | 7.00 | 0.00% |
| 1984 | 6.20 | -11.43% |
| 1985 | 5.40 | -12.90% |
| 1986 | 5.00 | -7.41% |
| 1987 | 4.50 | -10.00% |
| 1988 | 4.10 | -8.89% |
| 1989 | 4.40 | 7.32% |
| 1990 | 6.10 | 38.64% |
| 1991 | 4.30 | -29.51% |
| 1992 | 5.50 | 27.91% |
| 1993 | 4.70 | -14.55% |
| 1994 | 4.80 | 2.13% |
| 1995 | 4.60 | -4.17% |
| 1996 | 9.10 | 97.83% |
| 1997 | 5.70 | -37.36% |
| 1998 | 4.10 | -28.07% |
| 1999 | 5.00 | 21.95% |
| 2000 | 4.10 | -18.00% |
| 2001 | 3.90 | -4.88% |
| 2002 | 4.90 | 25.64% |
| 2003 | 4.00 | -18.37% |
| 2004 | 3.10 | -22.50% |
| 2005 | 1.90 | -38.71% |
| 2006 | 2.00 | 5.26% |
| 2007 | 1.70 | -15.00% |
| 2008 | 1.40 | -17.65% |
| 2009 | 1.00 | -28.57% |
| 2010 | .40 | -60.00% |
| 2011 | .30 | -25.00% |
| 2012 | .20 | -33.33% |
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