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| year | production | change |
| 1986 | 8.90 | NA |
| 1987 | 6.80 | -23.60% |
| 1988 | 7.60 | 11.76% |
| 1989 | 9.20 | 21.05% |
| 1990 | 10.00 | 8.70% |
| 1991 | 9.20 | -8.00% |
| 1992 | 8.30 | -9.78% |
| 1993 | 7.60 | -8.43% |
| 1994 | 7.30 | -3.95% |
| 1995 | 6.80 | -6.85% |
| 1996 | 4.20 | -38.24% |
| 1997 | 3.40 | -19.05% |
| 1998 | 4.20 | 23.53% |
| 1999 | 4.20 | 0.00% |
| 2000 | 1.80 | -57.14% |
| 2001 | 1.50 | -16.67% |
| 2002 | .80 | -46.67% |
| 2003 | .60 | -25.00% |
| 2004 | .60 | 0.00% |
| 2005 | .50 | -16.67% |
| 2006 | .50 | 0.00% |
| 2007 | .40 | -20.00% |
| 2008 | .20 | -50.00% |
| 2009 | .20 | 0.00% |
| 2010 | .90 | 350.00% |
| 2011 | .80 | -11.11% |
| 2012 | .40 | -50.00% |
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