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| year | production | change |
| 1980 | .70 | NA |
| 1981 | .70 | 0.00% |
| 1982 | .70 | 0.00% |
| 1983 | .80 | 14.29% |
| 1984 | .80 | 0.00% |
| 1985 | .90 | 12.50% |
| 1986 | .90 | 0.00% |
| 1987 | 1.10 | 22.22% |
| 1988 | 1.20 | 9.09% |
| 1989 | 1.20 | 0.00% |
| 1990 | 1.20 | 0.00% |
| 1991 | 1.20 | 0.00% |
| 1992 | 1.20 | 0.00% |
| 1993 | 1.40 | 16.67% |
| 1994 | 1.40 | 0.00% |
| 1995 | 1.50 | 7.14% |
| 1996 | 1.50 | 0.00% |
| 1997 | 1.60 | 6.67% |
| 1998 | 1.60 | 0.00% |
| 1999 | 1.60 | 0.00% |
| 2000 | 1.70 | 6.25% |
| 2001 | 2.00 | 17.65% |
| 2002 | 2.00 | 0.00% |
| 2003 | 2.30 | 15.00% |
| 2004 | 2.50 | 8.70% |
| 2005 | 2.80 | 12.00% |
| 2006 | 3.20 | 14.29% |
| 2007 | 3.50 | 9.38% |
| 2008 | 3.70 | 5.71% |
| 2009 | 3.90 | 5.41% |
| 2010 | 4.90 | 25.64% |
| 2011 | 6.30 | 28.57% |
| 2012 | 7.50 | 19.05% |
| 2013 | 8.60 | 14.67% |
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