|
| year | production | change |
| 1980 | .00 | NA |
| 1981 | .00 | 16.67 % |
| 1982 | .00 | 28.57 % |
| 1983 | .00 | 0.00 % |
| 1984 | .00 | 0.00 % |
| 1985 | .00 | 0.00 % |
| 1986 | .00 | 3,400.00 % |
| 1987 | .01 | 287.30 % |
| 1988 | .02 | 29.67 % |
| 1989 | .02 | 1.07 % |
| 1990 | .02 | 0.50 % |
| 1991 | .02 | 1.37 % |
| 1992 | .02 | 8.47 % |
| 1993 | .02 | -1.13 % |
| 1994 | .02 | 5.38 % |
| 1995 | .02 | 6.30 % |
| 1996 | .02 | 6.64 % |
| 1997 | .02 | -4.31 % |
| 1998 | .02 | -2.55 % |
| 1999 | .02 | 0.21 % |
| 2000 | .02 | 0.31 % |
| 2001 | .02 | 12.58 % |
| 2002 | .02 | 10.94 % |
| 2003 | .03 | 11.83 % |
| 2004 | .02 | -11.79 % |
| 2005 | .03 | 17.76 % |
| 2006 | .05 | 65.22 % |
| 2007 | .07 | 42.63 % |
| 2008 | .07 | 6.26 % |
| 2009 | .07 | -3.11 % |
| 2010 | .07 | 4.30 % |
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