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| year | production | change |
| 1980 | .47 | NA |
| 1981 | .46 | -1.49% |
| 1982 | .47 | 0.22% |
| 1983 | .46 | -2.15% |
| 1984 | .44 | -3.52% |
| 1985 | .46 | 3.87% |
| 1986 | .46 | -0.22% |
| 1987 | .40 | -12.75% |
| 1988 | .50 | 25.44% |
| 1989 | .50 | 0.20% |
| 1990 | .46 | -7.21% |
| 1991 | .47 | 1.30% |
| 1992 | .50 | 5.54% |
| 1993 | .51 | 3.43% |
| 1994 | .49 | -4.30% |
| 1995 | .52 | 5.92% |
| 1996 | .49 | -6.55% |
| 1997 | .49 | 1.65% |
| 1998 | .51 | 4.06% |
| 1999 | .55 | 6.82% |
| 2000 | .56 | 2.19% |
| 2001 | .55 | -1.43% |
| 2002 | .55 | -0.18% |
| 2003 | .49 | -11.80% |
| 2004 | .52 | 5.97% |
| 2005 | .51 | -1.55% |
| 2006 | .52 | 1.97% |
| 2007 | .54 | 4.64% |
| 2008 | .54 | -0.92% |
| 2009 | .56 | 4.85% |
| 2010 | .54 | -3.20% |
| 2011 | .51 | -7.17% |
| 2012 | .60 | 18.02% |
| 2013 | .57 | -4.87% |
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