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| year | production | change |
| 1980 | .01 | NA |
| 1981 | .01 | 10.00% |
| 1982 | .01 | 9.09% |
| 1983 | .01 | -8.33% |
| 1984 | .01 | -9.09% |
| 1985 | .01 | -10.00% |
| 1986 | .01 | 0.00% |
| 1987 | .01 | -33.33% |
| 1988 | .01 | -16.67% |
| 1989 | .01 | 40.00% |
| 1990 | .01 | 28.57% |
| 1991 | .01 | 0.00% |
| 1992 | .01 | 0.00% |
| 1993 | .01 | 0.00% |
| 1994 | .01 | 0.00% |
| 1995 | .01 | 22.22% |
| 1996 | .01 | 27.27% |
| 1997 | .01 | 0.00% |
| 1998 | .02 | 57.14% |
| 1999 | .03 | 40.91% |
| 2000 | .04 | 29.03% |
| 2001 | .04 | 0.00% |
| 2002 | .04 | 2.50% |
| 2003 | .04 | -12.20% |
| 2004 | .04 | 11.11% |
| 2005 | .04 | 5.00% |
| 2006 | .04 | 2.38% |
| 2007 | .05 | 11.63% |
| 2008 | .05 | 2.08% |
| 2009 | .05 | -4.08% |
| 2010 | .09 | 80.85% |
| 2011 | .12 | 42.35% |
| 2012 | .12 | -0.83% |
| 2013 | .14 | 18.33% |
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