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| year | production | change |
| 1986 | 9.60 | NA |
| 1987 | 9.70 | 1.04% |
| 1988 | 9.90 | 2.06% |
| 1989 | .90 | -90.91% |
| 1990 | .80 | -11.11% |
| 1991 | .80 | 0.00% |
| 1992 | .80 | 0.00% |
| 1993 | 2.10 | 162.50% |
| 1994 | 2.70 | 28.57% |
| 1995 | 1.00 | -62.96% |
| 1996 | 1.40 | 40.00% |
| 1997 | 1.40 | 0.00% |
| 1998 | 1.70 | 21.43% |
| 1999 | 2.10 | 23.53% |
| 2000 | 1.40 | -33.33% |
| 2001 | 2.50 | 78.57% |
| 2002 | 1.40 | -44.00% |
| 2003 | .70 | -50.00% |
| 2004 | 1.00 | 42.86% |
| 2005 | 1.20 | 20.00% |
| 2006 | .50 | -58.33% |
| 2007 | .20 | -60.00% |
| 2008 | .40 | 100.00% |
| 2009 | .30 | -25.00% |
| 2010 | .30 | 0.00% |
| 2011 | .60 | 100.00% |
| 2012 | .50 | -16.67% |
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