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| year | production | change |
| 1980 | .55 | NA |
| 1981 | .61 | 11.27% |
| 1982 | .50 | -17.97% |
| 1983 | .49 | -3.39% |
| 1984 | .58 | 18.76% |
| 1985 | .61 | 6.08% |
| 1986 | .53 | -13.58% |
| 1987 | .50 | -6.25% |
| 1988 | .51 | 2.42% |
| 1989 | .51 | 0.39% |
| 1990 | .52 | 1.18% |
| 1991 | .55 | 6.21% |
| 1992 | .51 | -6.03% |
| 1993 | .54 | 4.09% |
| 1994 | .56 | 4.86% |
| 1995 | .58 | 3.57% |
| 1996 | .62 | 6.02% |
| 1997 | .63 | 1.95% |
| 1998 | .63 | -0.48% |
| 1999 | .73 | 16.96% |
| 2000 | .82 | 11.49% |
| 2001 | .84 | 3.44% |
| 2002 | .94 | 11.98% |
| 2003 | 1.25 | 32.73% |
| 2004 | 1.35 | 8.06% |
| 2005 | 1.48 | 9.08% |
| 2006 | 1.71 | 15.91% |
| 2007 | 1.76 | 2.69% |
| 2008 | 1.76 | 0.28% |
| 2009 | 1.81 | 2.44% |
| 2010 | 1.86 | 2.88% |
| 2011 | 1.77 | -4.74% |
| 2012 | 1.81 | 2.37% |
| 2013 | 1.81 | 0.06% |
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