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| year | production | change |
| 1980 | .66 | NA |
| 1981 | .67 | 1.51% |
| 1982 | .76 | 12.50% |
| 1983 | .79 | 3.84% |
| 1984 | .93 | 18.73% |
| 1985 | 1.02 | 9.23% |
| 1986 | 1.39 | 36.25% |
| 1987 | 1.55 | 11.97% |
| 1988 | 1.62 | 4.06% |
| 1989 | 1.78 | 10.27% |
| 1990 | 1.96 | 9.71% |
| 1991 | 1.87 | -4.25% |
| 1992 | 1.90 | 1.39% |
| 1993 | 1.99 | 4.85% |
| 1994 | 2.01 | 1.06% |
| 1995 | 2.38 | 18.15% |
| 1996 | 2.61 | 9.97% |
| 1997 | 2.84 | 8.76% |
| 1998 | 3.05 | 7.32% |
| 1999 | 3.20 | 4.98% |
| 2000 | 3.08 | -3.87% |
| 2001 | 3.11 | 0.91% |
| 2002 | 2.91 | -6.44% |
| 2003 | 3.13 | 7.64% |
| 2004 | 3.24 | 3.68% |
| 2005 | 3.38 | 4.19% |
| 2006 | 3.61 | 6.87% |
| 2007 | 3.76 | 3.99% |
| 2008 | 4.04 | 7.70% |
| 2009 | 4.20 | 3.73% |
| 2010 | 4.53 | 7.89% |
| 2011 | 5.19 | 14.60% |
| 2012 | 5.33 | 2.83% |
| 2013 | 5.08 | -4.80% |
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