|
| year | production | change |
| 1980 | 35.00 | NA |
| 1981 | 36.00 | 2.86 % |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | .29 | NA |
| 1988 | .36 | 22.76 % |
| 1989 | .31 | -12.92 % |
| 1990 | .20 | -35.48 % |
| 1991 | .20 | 0.00 % |
| 1992 | .19 | -7.00 % |
| 1993 | .15 | -17.74 % |
| 1994 | .10 | -34.64 % |
| 1995 | .10 | 0.00 % |
| 1996 | .20 | 100.00 % |
| 1997 | .30 | 50.00 % |
| 1998 | .20 | -33.33 % |
| 1999 | .20 | 0.00 % |
| 2000 | .08 | -60.00 % |
| 2001 | .08 | 0.00 % |
| 2002 | .10 | 25.00 % |
| 2003 | .06 | -40.00 % |
| 2004 | .08 | 25.00 % |
| 2005 | .10 | 33.33 % |
| 2006 | .10 | 0.00 % |
| 2007 | .10 | 0.00 % |
| 2008 | .10 | 0.00 % |
| 2009 | .10 | 0.00 % |
| 2010 | .10 | 0.00 % |
| 2011 | .10 | 0.00 % |
| 2012 | .10 | 0.00 % |
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