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| year | production | change |
| 1980 | .03 | NA |
| 1981 | .03 | 6.25% |
| 1982 | .04 | 8.82% |
| 1983 | .04 | 8.11% |
| 1984 | .04 | 2.50% |
| 1985 | .04 | -2.44% |
| 1986 | .04 | 5.00% |
| 1987 | .04 | 2.38% |
| 1988 | .05 | 6.98% |
| 1989 | .05 | 2.17% |
| 1990 | .05 | -2.13% |
| 1991 | .05 | 0.00% |
| 1992 | .05 | 2.17% |
| 1993 | .05 | 2.13% |
| 1994 | .05 | 2.08% |
| 1995 | .05 | 4.08% |
| 1996 | .05 | 1.96% |
| 1997 | .06 | 7.69% |
| 1998 | .06 | 12.50% |
| 1999 | .07 | 15.87% |
| 2000 | .08 | 6.85% |
| 2001 | .08 | 5.13% |
| 2002 | .09 | 3.66% |
| 2003 | .09 | 0.00% |
| 2004 | .09 | 1.18% |
| 2005 | .09 | 0.00% |
| 2006 | .10 | 13.95% |
| 2007 | .12 | 20.41% |
| 2008 | .16 | 36.44% |
| 2009 | .16 | 1.24% |
| 2010 | .17 | 1.23% |
| 2011 | .17 | 0.61% |
| 2012 | .17 | 0.00% |
| 2013 | .17 | -0.60% |
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