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| year | production | change |
| 1986 | 3.90 | NA |
| 1987 | 4.10 | 5.13 % |
| 1988 | 3.90 | -4.88 % |
| 1989 | 4.10 | 5.13 % |
| 1990 | 4.20 | 2.44 % |
| 1991 | 4.00 | -4.76 % |
| 1992 | 2.70 | -32.50 % |
| 1993 | 2.70 | 0.00 % |
| 1994 | 2.60 | -3.70 % |
| 1995 | 3.00 | 15.38 % |
| 1996 | 2.80 | -6.67 % |
| 1997 | 1.90 | -32.14 % |
| 1998 | 1.60 | -15.79 % |
| 1999 | 1.70 | 6.25 % |
| 2000 | 3.00 | 76.47 % |
| 2001 | 2.90 | -3.33 % |
| 2002 | 2.20 | -24.14 % |
| 2003 | 3.00 | 36.36 % |
| 2004 | 2.00 | -33.33 % |
| 2005 | 2.60 | 30.00 % |
| 2006 | 2.00 | -23.08 % |
| 2007 | 1.90 | -5.00 % |
| 2008 | 1.80 | -5.26 % |
| 2009 | .90 | -50.00 % |
| 2010 | 1.10 | 22.22 % |
| 2011 | .90 | -18.18 % |
| 2012 | .90 | 0.00 % |
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