|
| year | production | change |
| 1980 | .33 | NA |
| 1981 | .35 | 5.02 % |
| 1982 | .38 | 8.22 % |
| 1983 | .41 | 8.15 % |
| 1984 | .44 | 8.08 % |
| 1985 | .46 | 5.51 % |
| 1986 | .54 | 15.63 % |
| 1987 | .52 | -2.92 % |
| 1988 | .56 | 7.90 % |
| 1989 | .58 | 2.94 % |
| 1990 | .59 | 2.22 % |
| 1991 | .61 | 3.75 % |
| 1992 | .60 | -2.50 % |
| 1993 | .61 | 2.80 % |
| 1994 | .63 | 3.05 % |
| 1995 | .63 | 0.31 % |
| 1996 | .66 | 3.34 % |
| 1997 | .69 | 5.90 % |
| 1998 | .65 | -6.85 % |
| 1999 | .67 | 4.34 % |
| 2000 | .68 | 1.23 % |
| 2001 | .68 | -0.18 % |
| 2002 | .71 | 4.22 % |
| 2003 | .65 | -9.02 % |
| 2004 | .65 | 0.33 % |
| 2005 | .61 | -6.50 % |
| 2006 | .63 | 4.41 % |
| 2007 | .67 | 5.06 % |
| 2008 | .69 | 3.51 % |
| 2009 | .70 | 2.11 % |
| 2010 | .75 | 6.69 % |
|
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