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| year | production | change |
| 1980 | .54 | NA |
| 1981 | .56 | 3.34% |
| 1982 | .56 | 0.90% |
| 1983 | .50 | -10.32% |
| 1984 | .54 | 6.55% |
| 1985 | .56 | 4.28% |
| 1986 | .54 | -2.86% |
| 1987 | .51 | -5.88% |
| 1988 | .46 | -11.13% |
| 1989 | .43 | -6.15% |
| 1990 | .41 | -5.15% |
| 1991 | .39 | -4.94% |
| 1992 | .37 | -3.90% |
| 1993 | .43 | 14.86% |
| 1994 | .44 | 3.29% |
| 1995 | .44 | 0.68% |
| 1996 | .43 | -3.39% |
| 1997 | .40 | -7.03% |
| 1998 | .40 | 1.26% |
| 1999 | .39 | -2.99% |
| 2000 | .39 | -0.77% |
| 2001 | .40 | 3.10% |
| 2002 | .40 | 1.00% |
| 2003 | .40 | -0.74% |
| 2004 | .41 | 1.75% |
| 2005 | .47 | 15.97% |
| 2006 | .51 | 6.99% |
| 2007 | .54 | 6.73% |
| 2008 | .59 | 9.09% |
| 2009 | .62 | 5.78% |
| 2010 | .81 | 29.90% |
| 2011 | .99 | 22.28% |
| 2012 | 1.01 | 2.43% |
| 2013 | 1.05 | 3.75% |
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