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| year | production | change |
| 1980 | .08 | NA |
| 1981 | .08 | 2.47% |
| 1982 | .01 | -93.98% |
| 1983 | .00 | -20.00% |
| 1984 | .00 | 0.00% |
| 1985 | .00 | 0.00% |
| 1986 | .00 | 0.00% |
| 1987 | .00 | -25.00% |
| 1988 | .00 | -33.33% |
| 1989 | .00 | 0.00% |
| 1990 | .00 | 0.00% |
| 1991 | .00 | 0.00% |
| 1992 | .00 | -50.00% |
| 1993 | .00 | 100.00% |
| 1994 | .00 | 0.00% |
| 1995 | .00 | -50.00% |
| 1996 | .00 | 0.00% |
| 1997 | .00 | 100.00% |
| 1998 | .00 | -50.00% |
| 1999 | .00 | 0.00% |
| 2000 | .00 | -14.35% |
| 2001 | .00 | -12.85% |
| 2002 | .00 | 19.82% |
| 2003 | .00 | 11.81% |
| 2004 | .03 | 2,700.00% |
| 2005 | .03 | -3.57% |
| 2006 | .04 | 29.63% |
| 2007 | .04 | 17.14% |
| 2008 | .05 | 26.83% |
| 2009 | .04 | -15.38% |
| 2010 | .06 | 31.82% |
| 2011 | .10 | 67.24% |
| 2012 | .06 | -43.30% |
| 2013 | .17 | 212.73% |
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