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| year | production | change |
| 1986 | 3.70 | NA |
| 1987 | 4.50 | 21.62% |
| 1988 | 4.60 | 2.22% |
| 1989 | 4.70 | 2.17% |
| 1990 | 3.90 | -17.02% |
| 1991 | 4.80 | 23.08% |
| 1992 | 5.60 | 16.67% |
| 1993 | 5.00 | -10.71% |
| 1994 | 6.00 | 20.00% |
| 1995 | 5.20 | -13.33% |
| 1996 | 5.10 | -1.92% |
| 1997 | 6.60 | 29.41% |
| 1998 | 6.70 | 1.52% |
| 1999 | 5.80 | -13.43% |
| 2000 | 5.80 | 0.00% |
| 2001 | 5.50 | -5.17% |
| 2002 | 4.20 | -23.64% |
| 2003 | .00 | -100.00% |
| 2004 | .00 | NA |
| 2005 | .50 | NA |
| 2006 | .40 | -20.00% |
| 2007 | .50 | 25.00% |
| 2008 | .40 | -20.00% |
| 2009 | .50 | 25.00% |
| 2010 | .50 | 0.00% |
| 2011 | .70 | 40.00% |
| 2012 | .60 | -14.29% |
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