|
| year | production | change |
| 1980 | .01 | NA |
| 1981 | .01 | -18.54 % |
| 1982 | .01 | 8.21 % |
| 1983 | .01 | -6.90 % |
| 1984 | .01 | 18.33 % |
| 1985 | .01 | 2.66 % |
| 1986 | .01 | 1.98 % |
| 1987 | .01 | -4.63 % |
| 1988 | .01 | -5.96 % |
| 1989 | .01 | 17.83 % |
| 1990 | .01 | 12.02 % |
| 1991 | .01 | 1.14 % |
| 1992 | .01 | 25.59 % |
| 1993 | .01 | -1.79 % |
| 1994 | .01 | 4.15 % |
| 1995 | .01 | 3.69 % |
| 1996 | .01 | 7.31 % |
| 1997 | .01 | 10.57 % |
| 1998 | .01 | 1.11 % |
| 1999 | .01 | 0.47 % |
| 2000 | .02 | 23.02 % |
| 2001 | .02 | 0.95 % |
| 2002 | .02 | 6.26 % |
| 2003 | .02 | 5.72 % |
| 2004 | .02 | 5.46 % |
| 2005 | .02 | -2.80 % |
| 2006 | .01 | -33.06 % |
| 2007 | .01 | 18.68 % |
| 2008 | .02 | 15.40 % |
| 2009 | .01 | -14.00 % |
| 2010 | .02 | 6.62 % |
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