|
| year | production | change |
| 1980 | .01 | NA |
| 1981 | .01 | 50.19 % |
| 1982 | .01 | 3.50 % |
| 1983 | .01 | 0.63 % |
| 1984 | .01 | -2.61 % |
| 1985 | .01 | 21.97 % |
| 1986 | .01 | 0.00 % |
| 1987 | .01 | -0.10 % |
| 1988 | .01 | -0.63 % |
| 1989 | .01 | 1.90 % |
| 1990 | .02 | 57.04 % |
| 1991 | .02 | 5.80 % |
| 1992 | .02 | 5.79 % |
| 1993 | .02 | -0.18 % |
| 1994 | .02 | -0.24 % |
| 1995 | .02 | -8.04 % |
| 1996 | .02 | 28.55 % |
| 1997 | .03 | 25.76 % |
| 1998 | .03 | 36.40 % |
| 1999 | .15 | 324.35 % |
| 2000 | .36 | 149.64 % |
| 2001 | .41 | 11.85 % |
| 2002 | .46 | 13.51 % |
| 2003 | .52 | 12.22 % |
| 2004 | .65 | 26.25 % |
| 2005 | .67 | 2.09 % |
| 2006 | .72 | 7.96 % |
| 2007 | .88 | 22.17 % |
| 2008 | .91 | 3.24 % |
| 2009 | .93 | 2.74 % |
| 2010 | .99 | 6.18 % |
|
|