|
| year | production | change |
| 1980 | .55 | NA |
| 1981 | .61 | 11.35 % |
| 1982 | .50 | -17.95 % |
| 1983 | .48 | -3.56 % |
| 1984 | .58 | 18.76 % |
| 1985 | .61 | 6.10 % |
| 1986 | .53 | -13.46 % |
| 1987 | .50 | -6.29 % |
| 1988 | .51 | 2.44 % |
| 1989 | .51 | 0.26 % |
| 1990 | .52 | 1.27 % |
| 1991 | .55 | 6.21 % |
| 1992 | .51 | -5.98 % |
| 1993 | .53 | 3.94 % |
| 1994 | .56 | 4.93 % |
| 1995 | .58 | 3.59 % |
| 1996 | .62 | 5.98 % |
| 1997 | .63 | 2.04 % |
| 1998 | .63 | -0.49 % |
| 1999 | .73 | 16.98 % |
| 2000 | .82 | 11.45 % |
| 2001 | .84 | 3.38 % |
| 2002 | .94 | 11.96 % |
| 2003 | 1.25 | 32.76 % |
| 2004 | 1.35 | 8.10 % |
| 2005 | 1.48 | 9.11 % |
| 2006 | 1.71 | 15.90 % |
| 2007 | 1.76 | 2.67 % |
| 2008 | 1.76 | 0.29 % |
| 2009 | 1.81 | 2.44 % |
| 2010 | 1.86 | 2.87 % |
|
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