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| year | production | change |
| 1986 | 8.80 | NA |
| 1987 | 7.60 | -13.64% |
| 1988 | 8.20 | 7.89% |
| 1989 | 5.80 | -29.27% |
| 1990 | 5.50 | -5.17% |
| 1991 | 5.80 | 5.45% |
| 1992 | 5.80 | 0.00% |
| 1993 | 3.90 | -32.76% |
| 1994 | 2.80 | -28.21% |
| 1995 | 2.50 | -10.71% |
| 1996 | 2.30 | -8.00% |
| 1997 | 7.20 | 213.04% |
| 1998 | 2.50 | -65.28% |
| 1999 | 1.30 | -48.00% |
| 2000 | .70 | -46.15% |
| 2001 | .70 | 0.00% |
| 2002 | .60 | -14.29% |
| 2003 | .30 | -50.00% |
| 2004 | .50 | 66.67% |
| 2005 | .50 | 0.00% |
| 2006 | .40 | -20.00% |
| 2007 | .40 | 0.00% |
| 2008 | .40 | 0.00% |
| 2009 | .60 | 50.00% |
| 2010 | .70 | 16.67% |
| 2011 | .50 | -28.57% |
| 2012 | 1.40 | 180.00% |
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