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| year | production | change |
| 1980 | .02 | NA |
| 1981 | .02 | 5.26% |
| 1982 | .02 | 5.00% |
| 1983 | .02 | 9.52% |
| 1984 | .02 | 4.35% |
| 1985 | .03 | 4.17% |
| 1986 | .03 | 0.00% |
| 1987 | .02 | -4.00% |
| 1988 | .02 | 0.00% |
| 1989 | .02 | 0.00% |
| 1990 | .02 | 0.00% |
| 1991 | .03 | 4.17% |
| 1992 | .03 | 8.00% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 0.00% |
| 1995 | .03 | 3.70% |
| 1996 | .03 | 7.14% |
| 1997 | .03 | 10.00% |
| 1998 | .04 | 6.06% |
| 1999 | .04 | 0.00% |
| 2000 | .04 | 11.43% |
| 2001 | .04 | 11.43% |
| 2002 | .04 | -3.35% |
| 2003 | .04 | -2.38% |
| 2004 | .04 | -2.44% |
| 2005 | .04 | 2.50% |
| 2006 | .04 | 2.44% |
| 2007 | .05 | 7.14% |
| 2008 | .05 | 15.56% |
| 2009 | .05 | 0.00% |
| 2010 | .05 | 1.92% |
| 2011 | .05 | 1.89% |
| 2012 | .05 | 0.00% |
| 2013 | .06 | 1.85% |
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