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| year | production | change |
| 1980 | .06 | NA |
| 1981 | .06 | 1.69% |
| 1982 | .06 | -6.67% |
| 1983 | .03 | -44.64% |
| 1984 | .02 | -25.81% |
| 1985 | .03 | 43.48% |
| 1986 | .05 | 39.39% |
| 1987 | .05 | 4.35% |
| 1988 | .05 | 4.17% |
| 1989 | .05 | 8.00% |
| 1990 | .06 | 9.26% |
| 1991 | .06 | 6.78% |
| 1992 | .07 | 11.11% |
| 1993 | .07 | -2.86% |
| 1994 | .07 | -4.41% |
| 1995 | .07 | 9.23% |
| 1996 | .08 | 14.08% |
| 1997 | .08 | -1.23% |
| 1998 | .05 | -37.50% |
| 1999 | .07 | 30.00% |
| 2000 | .08 | 26.15% |
| 2001 | .08 | 1.22% |
| 2002 | .07 | -20.48% |
| 2003 | .05 | -18.18% |
| 2004 | .07 | 25.93% |
| 2005 | .07 | 1.47% |
| 2006 | .07 | -1.45% |
| 2007 | .05 | -27.94% |
| 2008 | .07 | 48.98% |
| 2009 | .08 | 8.22% |
| 2010 | .08 | 5.06% |
| 2011 | .24 | 186.75% |
| 2012 | .25 | 3.36% |
| 2013 | .29 | 17.89% |
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