|
| year | production | change |
| 1980 | .02 | NA |
| 1981 | .03 | 105.27 % |
| 1982 | .04 | 13.20 % |
| 1983 | .06 | 62.09 % |
| 1984 | .06 | 2.30 % |
| 1985 | .07 | 19.61 % |
| 1986 | .06 | -25.49 % |
| 1987 | .05 | -7.15 % |
| 1988 | .04 | -24.99 % |
| 1989 | .02 | -55.03 % |
| 1990 | .02 | 3.29 % |
| 1991 | .02 | -3.63 % |
| 1992 | .01 | -19.11 % |
| 1993 | .01 | -12.10 % |
| 1994 | .03 | 117.18 % |
| 1995 | .04 | 38.40 % |
| 1996 | .07 | 98.10 % |
| 1997 | .08 | 11.58 % |
| 1998 | .09 | 6.07 % |
| 1999 | .10 | 15.09 % |
| 2000 | .09 | -7.08 % |
| 2001 | .09 | -0.57 % |
| 2002 | .09 | -1.52 % |
| 2003 | .11 | 17.92 % |
| 2004 | .12 | 12.77 % |
| 2005 | .15 | 20.54 % |
| 2006 | .20 | 34.52 % |
| 2007 | .18 | -5.98 % |
| 2008 | .20 | 11.03 % |
| 2009 | .20 | -0.64 % |
| 2010 | .16 | -19.04 % |
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