|
| year | production | change |
| 1980 | .07 | NA |
| 1981 | .09 | 27.62 % |
| 1982 | .10 | 2.84 % |
| 1983 | .10 | 4.40 % |
| 1984 | .10 | 0.34 % |
| 1985 | .12 | 21.06 % |
| 1986 | .12 | -0.31 % |
| 1987 | .12 | -4.52 % |
| 1988 | .12 | 5.33 % |
| 1989 | .12 | -1.35 % |
| 1990 | .12 | -0.84 % |
| 1991 | .02 | -82.46 % |
| 1992 | .02 | -18.55 % |
| 1993 | .02 | 0.29 % |
| 1994 | .02 | 0.47 % |
| 1995 | .01 | -24.17 % |
| 1996 | .01 | 5.53 % |
| 1997 | .01 | -2.33 % |
| 1998 | .01 | -0.97 % |
| 1999 | .01 | 1.66 % |
| 2000 | .01 | 1.85 % |
| 2001 | .01 | -44.33 % |
| 2002 | .01 | 4.83 % |
| 2003 | .01 | 0.75 % |
| 2004 | .01 | -10.14 % |
| 2005 | .01 | 2.89 % |
| 2006 | .01 | 6.28 % |
| 2007 | .02 | 89.94 % |
| 2008 | .02 | 10.99 % |
| 2009 | .02 | 31.15 % |
| 2010 | .03 | 21.84 % |
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