|
| year | production | change |
| 1980 | .24 | NA |
| 1981 | .29 | 22.66 % |
| 1982 | .31 | 4.64 % |
| 1983 | .36 | 18.12 % |
| 1984 | .41 | 13.31 % |
| 1985 | .46 | 11.75 % |
| 1986 | .42 | -7.17 % |
| 1987 | .48 | 12.74 % |
| 1988 | .41 | -13.29 % |
| 1989 | .41 | -1.35 % |
| 1990 | .50 | 21.66 % |
| 1991 | .43 | -14.00 % |
| 1992 | .44 | 2.69 % |
| 1993 | .41 | -5.76 % |
| 1994 | .43 | 4.32 % |
| 1995 | .44 | 0.86 % |
| 1996 | .46 | 4.89 % |
| 1997 | .44 | -2.92 % |
| 1998 | .46 | 3.26 % |
| 1999 | .46 | 1.43 % |
| 2000 | .46 | 0.07 % |
| 2001 | .44 | -4.42 % |
| 2002 | .47 | 5.20 % |
| 2003 | .46 | -1.24 % |
| 2004 | .47 | 1.62 % |
| 2005 | .48 | 1.44 % |
| 2006 | .46 | -2.25 % |
| 2007 | .48 | 2.61 % |
| 2008 | .48 | 0.64 % |
| 2009 | .48 | 0.61 % |
| 2010 | .49 | 1.38 % |
|
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