|
| year | production | change |
| 1980 | 4.50 | NA |
| 1981 | 4.24 | -5.78 % |
| 1982 | | NA |
| 1983 | 3.50 | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 4.40 | NA |
| 1988 | .35 | -92.05 % |
| 1989 | .35 | 0.00 % |
| 1990 | .49 | 41.14 % |
| 1991 | .32 | -34.30 % |
| 1992 | .28 | -13.11 % |
| 1993 | 2.47 | 776.60 % |
| 1994 | 2.12 | -14.24 % |
| 1995 | 1.77 | -16.51 % |
| 1996 | 1.41 | -20.34 % |
| 1997 | 1.41 | 0.18 % |
| 1998 | 1.06 | -25.00 % |
| 1999 | .71 | -33.33 % |
| 2000 | 2.12 | 200.00 % |
| 2001 | .14 | -93.33 % |
| 2002 | .07 | -50.00 % |
| 2003 | .07 | 0.00 % |
| 2004 | .04 | -49.99 % |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | 10.59 | NA |
| 2008 | 3.88 | -63.33 % |
| 2009 | .35 | -90.91 % |
| 2010 | 1.77 | 400.00 % |
| 2011 | 14.48 | 720.00 % |
|
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