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| year | production | change |
| 1980 | .25 | NA |
| 1981 | .26 | 6.94% |
| 1982 | .27 | 3.44% |
| 1983 | .27 | -1.11% |
| 1984 | .28 | 2.61% |
| 1985 | .26 | -7.27% |
| 1986 | .25 | -2.35% |
| 1987 | .24 | -2.81% |
| 1988 | .24 | -1.65% |
| 1989 | .24 | 1.26% |
| 1990 | .22 | -10.37% |
| 1991 | .23 | 8.33% |
| 1992 | .25 | 8.12% |
| 1993 | .23 | -11.07% |
| 1994 | .21 | -6.22% |
| 1995 | .20 | -5.21% |
| 1996 | .22 | 8.00% |
| 1997 | .25 | 13.43% |
| 1998 | .25 | 0.82% |
| 1999 | .25 | 2.43% |
| 2000 | .25 | -2.77% |
| 2001 | .24 | -1.22% |
| 2002 | .25 | 3.70% |
| 2003 | .26 | 1.59% |
| 2004 | .27 | 5.47% |
| 2005 | .26 | -2.22% |
| 2006 | .27 | 0.76% |
| 2007 | .24 | -8.27% |
| 2008 | .24 | -3.69% |
| 2009 | .24 | 3.83% |
| 2010 | .25 | 1.64% |
| 2011 | .22 | -11.29% |
| 2012 | .22 | -1.82% |
| 2013 | .21 | -3.24% |
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