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| year | production | change |
| 1986 | 1.80 | NA |
| 1987 | 2.30 | 27.78% |
| 1988 | 1.80 | -21.74% |
| 1989 | 1.70 | -5.56% |
| 1990 | 2.70 | 58.82% |
| 1991 | 2.50 | -7.41% |
| 1992 | 2.80 | 12.00% |
| 1993 | 2.30 | -17.86% |
| 1994 | 2.50 | 8.70% |
| 1995 | 1.80 | -28.00% |
| 1996 | 1.40 | -22.22% |
| 1997 | 1.10 | -21.43% |
| 1998 | 1.20 | 9.09% |
| 1999 | 1.10 | -8.33% |
| 2000 | 1.00 | -9.09% |
| 2001 | 1.10 | 10.00% |
| 2002 | .90 | -18.18% |
| 2003 | .80 | -11.11% |
| 2004 | .70 | -12.50% |
| 2005 | .50 | -28.57% |
| 2006 | .00 | -100.00% |
| 2007 | .00 | NA |
| 2008 | .00 | NA |
| 2009 | .00 | NA |
| 2010 | .00 | NA |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
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