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| year | production | change |
| 1986 | 2.30 | NA |
| 1987 | 2.90 | 26.09% |
| 1988 | 3.00 | 3.45% |
| 1989 | 2.40 | -20.00% |
| 1990 | 1.80 | -25.00% |
| 1991 | 2.50 | 38.89% |
| 1992 | 2.20 | -12.00% |
| 1993 | 2.60 | 18.18% |
| 1994 | 2.70 | 3.85% |
| 1995 | 2.70 | 0.00% |
| 1996 | 3.50 | 29.63% |
| 1997 | 2.10 | -40.00% |
| 1998 | 2.20 | 4.76% |
| 1999 | 2.20 | 0.00% |
| 2000 | 1.10 | -50.00% |
| 2001 | 2.10 | 90.91% |
| 2002 | 1.30 | -38.10% |
| 2003 | 1.40 | 7.69% |
| 2004 | 2.30 | 64.29% |
| 2005 | 1.80 | -21.74% |
| 2006 | 1.40 | -22.22% |
| 2007 | 2.60 | 85.71% |
| 2008 | 3.60 | 38.46% |
| 2009 | 1.20 | -66.67% |
| 2010 | 1.50 | 25.00% |
| 2011 | .00 | -100.00% |
| 2012 | .40 | NA |
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