|
| year | production | change |
| 1980 | .01 | NA |
| 1981 | .01 | 2.44 % |
| 1982 | .01 | 8.89 % |
| 1983 | .01 | -4.58 % |
| 1984 | .01 | -0.52 % |
| 1985 | .01 | 11.23 % |
| 1986 | .01 | 14.25 % |
| 1987 | .01 | 16.02 % |
| 1988 | .01 | 5.77 % |
| 1989 | .02 | 8.21 % |
| 1990 | .02 | 19.78 % |
| 1991 | .02 | -1.30 % |
| 1992 | .02 | 14.99 % |
| 1993 | .02 | -1.28 % |
| 1994 | .02 | 1.16 % |
| 1995 | .02 | 14.34 % |
| 1996 | .02 | -17.75 % |
| 1997 | .02 | -3.02 % |
| 1998 | .02 | 19.44 % |
| 1999 | .02 | 1.81 % |
| 2000 | .02 | 0.25 % |
| 2001 | .02 | -1.81 % |
| 2002 | .02 | 2.48 % |
| 2003 | .02 | -13.64 % |
| 2004 | .02 | 10.91 % |
| 2005 | .03 | 7.91 % |
| 2006 | .02 | -2.34 % |
| 2007 | .02 | -13.91 % |
| 2008 | .02 | 9.90 % |
| 2009 | .02 | -18.91 % |
| 2010 | .03 | 33.90 % |
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