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| year | production | change |
| 1980 | .80 | NA |
| 1981 | .50 | -37.50% |
| 1982 | .40 | -20.00% |
| 1983 | .30 | -25.00% |
| 1984 | .40 | 33.33% |
| 1985 | .30 | -25.00% |
| 1986 | .40 | 33.33% |
| 1987 | .40 | 0.00% |
| 1988 | .40 | 0.00% |
| 1989 | .40 | 0.00% |
| 1990 | .30 | -25.00% |
| 1991 | .20 | -33.33% |
| 1992 | .40 | 100.00% |
| 1993 | .40 | 0.00% |
| 1994 | .30 | -25.00% |
| 1995 | .10 | -66.67% |
| 1996 | .10 | 0.00% |
| 1997 | .06 | -36.00% |
| 1998 | .06 | -3.13% |
| 1999 | .09 | 50.00% |
| 2000 | .10 | 7.53% |
| 2001 | .60 | 500.00% |
| 2002 | 2.40 | 300.00% |
| 2003 | 2.30 | -4.17% |
| 2004 | 2.90 | 26.09% |
| 2005 | 2.80 | -3.45% |
| 2006 | 3.00 | 7.14% |
| 2007 | 2.70 | -10.00% |
| 2008 | 2.20 | -18.52% |
| 2009 | 2.60 | 18.18% |
| 2010 | 2.50 | -3.85% |
| 2011 | 2.00 | -20.00% |
| 2012 | 2.10 | 5.00% |
| 2013 | 1.30 | -38.10% |
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