|
| year | production | change |
| 1980 | .60 | NA |
| 1981 | .60 | -0.69 % |
| 1982 | .63 | 4.95 % |
| 1983 | .63 | 0.95 % |
| 1984 | .66 | 3.86 % |
| 1985 | .69 | 4.91 % |
| 1986 | .68 | -1.31 % |
| 1987 | .70 | 3.46 % |
| 1988 | .69 | -1.05 % |
| 1989 | .66 | -4.49 % |
| 1990 | .61 | -8.49 % |
| 1991 | .57 | -6.37 % |
| 1992 | .56 | -1.92 % |
| 1993 | .53 | -5.44 % |
| 1994 | .53 | 0.42 % |
| 1995 | .52 | -1.39 % |
| 1996 | .51 | -1.41 % |
| 1997 | .53 | 2.33 % |
| 1998 | .48 | -9.02 % |
| 1999 | .46 | -4.24 % |
| 2000 | .45 | -1.18 % |
| 2001 | .45 | -1.01 % |
| 2002 | .42 | -6.87 % |
| 2003 | .39 | -6.37 % |
| 2004 | .40 | 1.41 % |
| 2005 | .40 | 0.81 % |
| 2006 | .40 | -1.10 % |
| 2007 | .38 | -2.78 % |
| 2008 | .39 | 0.98 % |
| 2009 | .41 | 4.88 % |
| 2010 | .40 | -0.61 % |
|
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