|
| year | production | change |
| 1980 | .10 | NA |
| 1981 | .08 | -19.22 % |
| 1982 | .10 | 34.10 % |
| 1983 | .12 | 17.39 % |
| 1984 | .15 | 23.75 % |
| 1985 | .15 | 1.64 % |
| 1986 | .15 | -0.95 % |
| 1987 | .14 | -9.02 % |
| 1988 | .15 | 11.12 % |
| 1989 | .16 | 2.30 % |
| 1990 | .16 | -0.56 % |
| 1991 | .15 | -5.85 % |
| 1992 | .16 | 6.11 % |
| 1993 | .17 | 6.02 % |
| 1994 | .17 | 2.99 % |
| 1995 | .16 | -7.36 % |
| 1996 | .17 | 5.47 % |
| 1997 | .16 | -5.06 % |
| 1998 | .16 | 3.31 % |
| 1999 | .21 | 27.82 % |
| 2000 | .23 | 8.26 % |
| 2001 | .23 | 1.36 % |
| 2002 | .30 | 29.91 % |
| 2003 | .36 | 18.72 % |
| 2004 | .40 | 11.79 % |
| 2005 | .40 | 0.47 % |
| 2006 | .38 | -4.05 % |
| 2007 | .41 | 7.51 % |
| 2008 | .43 | 5.51 % |
| 2009 | .46 | 5.16 % |
| 2010 | .48 | 5.66 % |
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