|
| year | production | change |
| 1980 | .39 | NA |
| 1981 | .37 | -5.13 % |
| 1982 | .38 | 2.70 % |
| 1983 | .45 | 18.42 % |
| 1984 | .47 | 4.44 % |
| 1985 | .51 | 8.51 % |
| 1986 | .50 | -1.96 % |
| 1987 | .31 | -38.00 % |
| 1988 | .28 | -9.68 % |
| 1989 | .22 | -21.43 % |
| 1990 | .24 | 9.09 % |
| 1991 | .42 | 75.00 % |
| 1992 | .40 | -4.76 % |
| 1993 | .35 | -12.50 % |
| 1994 | .34 | -2.86 % |
| 1995 | .34 | 0.00 % |
| 1996 | .38 | 11.76 % |
| 1997 | .57 | 50.00 % |
| 1998 | .57 | 0.00 % |
| 1999 | .48 | -15.79 % |
| 2000 | .53 | 10.42 % |
| 2001 | .74 | 39.62 % |
| 2002 | .90 | 21.62 % |
| 2003 | .82 | -8.89 % |
| 2004 | 1.26 | 53.66 % |
| 2005 | 1.94 | 53.97 % |
| 2006 | 2.52 | 29.90 % |
|
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