|
| year | production | change |
| 1980 | .00 | NA |
| 1981 | .00 | 18.42 % |
| 1982 | .00 | -0.89 % |
| 1983 | .00 | 51.57 % |
| 1984 | .00 | 5.62 % |
| 1985 | .00 | -1.12 % |
| 1986 | .00 | 29.18 % |
| 1987 | .01 | 24.12 % |
| 1988 | .01 | 1.59 % |
| 1989 | .01 | -2.78 % |
| 1990 | .01 | 63.15 % |
| 1991 | .01 | 3.62 % |
| 1992 | .01 | -8.89 % |
| 1993 | .01 | 4.18 % |
| 1994 | .01 | 7.92 % |
| 1995 | .01 | 23.76 % |
| 1996 | .01 | 2.59 % |
| 1997 | .01 | -9.44 % |
| 1998 | .01 | 5.12 % |
| 1999 | .01 | 25.98 % |
| 2000 | .02 | 14.72 % |
| 2001 | .02 | 13.36 % |
| 2002 | .02 | 12.88 % |
| 2003 | .02 | 7.26 % |
| 2004 | .02 | 3.66 % |
| 2005 | .03 | 4.82 % |
| 2006 | .03 | 8.49 % |
| 2007 | .03 | 0.80 % |
| 2008 | .03 | 0.51 % |
| 2009 | .03 | 9.49 % |
| 2010 | .03 | 3.29 % |
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