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| year | production | change |
| 1986 | 3.80 | NA |
| 1987 | 4.50 | 18.42% |
| 1988 | 3.90 | -13.33% |
| 1989 | 5.20 | 33.33% |
| 1990 | 3.80 | -26.92% |
| 1991 | 3.10 | -18.42% |
| 1992 | 4.60 | 48.39% |
| 1993 | 4.90 | 6.52% |
| 1994 | 4.20 | -14.29% |
| 1995 | 5.80 | 38.10% |
| 1996 | 5.60 | -3.45% |
| 1997 | 6.10 | 8.93% |
| 1998 | .50 | -91.80% |
| 1999 | .00 | -100.00% |
| 2001 | 3.00 | NA |
| 2002 | 4.50 | 50.00% |
| 2003 | 4.20 | -6.67% |
| 2004 | 4.60 | 9.52% |
| 2005 | 4.10 | -10.87% |
| 2006 | 5.60 | 36.59% |
| 2007 | 6.10 | 8.93% |
| 2008 | 3.80 | -37.70% |
| 2009 | 1.80 | -52.63% |
| 2010 | 3.80 | 111.11% |
| 2011 | .00 | -100.00% |
| 2012 | .00 | NA |
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