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| year | production | change |
| 1980 | .14 | NA |
| 1981 | .21 | 48.57% |
| 1982 | .26 | 24.04% |
| 1983 | .27 | 4.26% |
| 1984 | .32 | 17.47% |
| 1985 | .43 | 34.81% |
| 1986 | .41 | -4.23% |
| 1987 | .40 | -1.47% |
| 1988 | .38 | -5.22% |
| 1989 | .40 | 3.94% |
| 1990 | .38 | -4.80% |
| 1991 | .36 | -4.51% |
| 1992 | .33 | -7.50% |
| 1993 | .30 | -9.31% |
| 1994 | .26 | -13.25% |
| 1995 | .27 | 2.67% |
| 1996 | .26 | -1.86% |
| 1997 | .30 | 13.64% |
| 1998 | .29 | -2.33% |
| 1999 | .25 | -14.33% |
| 2000 | .22 | -12.75% |
| 2001 | .20 | -7.76% |
| 2002 | .18 | -8.91% |
| 2003 | .18 | -1.63% |
| 2004 | .18 | 1.10% |
| 2005 | .22 | 18.03% |
| 2006 | .23 | 7.87% |
| 2007 | .22 | -6.01% |
| 2008 | .22 | 0.46% |
| 2009 | .21 | -5.91% |
| 2010 | .19 | -8.21% |
| 2011 | .18 | -4.21% |
| 2012 | .16 | -11.54% |
| 2013 | .20 | 21.74% |
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