|
| year | production | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | 21.00 | NA |
| 1983 | 24.00 | 14.29 % |
| 1984 | 26.00 | 8.33 % |
| 1985 | 25.00 | -3.85 % |
| 1986 | 25.00 | 0.00 % |
| 1987 | 24.00 | -4.00 % |
| 1988 | 21.00 | -12.50 % |
| 1989 | 17.00 | -19.05 % |
| 1990 | 15.00 | -11.76 % |
| 1991 | 16.00 | 6.67 % |
| 1992 | 13.27 | -17.06 % |
| 1993 | 10.84 | -18.29 % |
| 1994 | 10.25 | -5.50 % |
| 1995 | | NA |
| 1996 | | NA |
| 1997 | 9.08 | NA |
| 1998 | 6.49 | -28.49 % |
| 1999 | .34 | -94.77 % |
| 2000 | 4.75 | 1,297.77 % |
| 2001 | 4.99 | 5.12 % |
| 2002 | 3.16 | -36.66 % |
| 2003 | 2.83 | -10.49 % |
| 2004 | 2.84 | 0.21 % |
| 2005 | 2.67 | -5.91 % |
| 2006 | 1.84 | -31.11 % |
| 2007 | 1.25 | -32.19 % |
| 2008 | | NA |
| 2009 | 1.17 | NA |
| 2010 | 2.33 | 99.91 % |
| 2011 | 1.75 | -25.00 % |
| 2012 | 1.58 | -9.48 % |
|
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