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| year | production | change |
| 1980 | .80 | NA |
| 1981 | 1.00 | 25.00% |
| 1982 | 1.00 | 0.00% |
| 1983 | 1.00 | 0.00% |
| 1984 | 5.30 | 430.00% |
| 1985 | 5.30 | 0.00% |
| 1986 | 5.70 | 7.55% |
| 1987 | 8.80 | 54.39% |
| 1988 | 8.00 | -9.09% |
| 1989 | 8.80 | 10.00% |
| 1990 | 4.60 | -47.73% |
| 1991 | 4.60 | 0.00% |
| 1992 | 5.00 | 8.70% |
| 1993 | 5.40 | 8.00% |
| 1994 | 6.20 | 14.81% |
| 1995 | 5.90 | -4.84% |
| 1996 | 5.20 | -11.86% |
| 1997 | 5.70 | 9.62% |
| 1998 | 7.10 | 24.56% |
| 1999 | 9.20 | 29.58% |
| 2000 | 9.20 | 0.00% |
| 2001 | 8.10 | -11.96% |
| 2002 | 8.00 | -1.23% |
| 2003 | 8.50 | 6.25% |
| 2004 | 8.20 | -3.53% |
| 2005 | 8.90 | 8.54% |
| 2006 | 9.00 | 1.12% |
| 2007 | 8.20 | -8.89% |
| 2008 | 9.70 | 18.29% |
| 2009 | 9.30 | -4.12% |
| 2010 | 13.00 | 39.78% |
| 2011 | 14.00 | 7.69% |
| 2012 | 17.00 | 21.43% |
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