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| year | production | change |
| 1986 | 4.90 | NA |
| 1987 | 6.10 | 24.49% |
| 1988 | 5.00 | -18.03% |
| 1989 | 4.70 | -6.00% |
| 1990 | 4.90 | 4.26% |
| 1991 | 5.50 | 12.24% |
| 1992 | 5.70 | 3.64% |
| 1993 | 5.80 | 1.75% |
| 1994 | 5.80 | 0.00% |
| 1995 | 5.80 | 0.00% |
| 1996 | 6.70 | 15.52% |
| 1997 | 1.70 | -74.63% |
| 1998 | 1.40 | -17.65% |
| 1999 | 1.10 | -21.43% |
| 2000 | 1.50 | 36.36% |
| 2001 | 1.50 | 0.00% |
| 2002 | 1.20 | -20.00% |
| 2003 | 1.20 | 0.00% |
| 2004 | 1.30 | 8.33% |
| 2005 | 1.50 | 15.38% |
| 2006 | 1.40 | -6.67% |
| 2007 | .90 | -35.71% |
| 2008 | .80 | -11.11% |
| 2009 | 1.00 | 25.00% |
| 2010 | 6.50 | 550.00% |
| 2011 | 7.10 | 9.23% |
| 2012 | 5.30 | -25.35% |
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