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| year | production | change |
| 1980 | .67 | NA |
| 1981 | .74 | 11.25% |
| 1982 | .64 | -13.12% |
| 1983 | .64 | -1.08% |
| 1984 | .74 | 16.16% |
| 1985 | .78 | 5.81% |
| 1986 | .72 | -7.53% |
| 1987 | .69 | -4.96% |
| 1988 | .70 | 2.19% |
| 1989 | .72 | 1.71% |
| 1990 | .72 | 1.24% |
| 1991 | .75 | 3.71% |
| 1992 | .73 | -3.32% |
| 1993 | .77 | 6.47% |
| 1994 | .80 | 3.84% |
| 1995 | .83 | 2.94% |
| 1996 | .90 | 8.86% |
| 1997 | .95 | 5.22% |
| 1998 | .94 | -1.05% |
| 1999 | 1.10 | 17.61% |
| 2000 | 1.20 | 8.44% |
| 2001 | 1.22 | 1.83% |
| 2002 | 1.32 | 8.05% |
| 2003 | 1.67 | 26.91% |
| 2004 | 1.79 | 7.13% |
| 2005 | 1.90 | 6.26% |
| 2006 | 2.15 | 13.36% |
| 2007 | 2.20 | 2.13% |
| 2008 | 2.25 | 2.18% |
| 2009 | 2.27 | 0.95% |
| 2010 | 2.35 | 3.69% |
| 2011 | 2.27 | -3.57% |
| 2012 | 2.32 | 2.38% |
| 2013 | 2.34 | 0.61% |
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