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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 | 11.00 | 1,000.00% |
| 1985 | 10.00 | -9.09% |
| 1986 | 9.70 | -3.00% |
| 1987 | 10.00 | 3.09% |
| 1988 | 11.00 | 10.00% |
| 1989 | 11.00 | 0.00% |
| 1990 | 11.00 | 0.00% |
| 1991 | 9.80 | -10.91% |
| 1992 | 10.00 | 2.04% |
| 1993 | 10.00 | 0.00% |
| 1994 | 9.60 | -4.00% |
| 1995 | 6.70 | -30.21% |
| 1996 | 2.70 | -59.70% |
| 1997 | 2.30 | -14.81% |
| 1998 | 2.20 | -4.35% |
| 1999 | 2.30 | 4.55% |
| 2000 | 2.40 | 4.35% |
| 2001 | 2.50 | 4.17% |
| 2002 | 2.90 | 16.00% |
| 2003 | 3.00 | 3.45% |
| 2004 | 2.90 | -3.33% |
| 2005 | 2.60 | -10.34% |
| 2006 | 2.60 | 0.00% |
| 2007 | 2.60 | 0.00% |
| 2008 | 2.70 | 3.85% |
| 2009 | 2.30 | -14.81% |
| 2010 | 2.40 | 4.35% |
| 2011 | 2.40 | 0.00% |
| 2012 | 2.00 | -16.67% |
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