|
| year | production | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | 2.22 | NA |
| 1983 | 2.12 | -4.76 % |
| 1984 | 2.33 | 10.00 % |
| 1985 | 2.19 | -6.06 % |
| 1986 | 3.00 | 37.10 % |
| 1987 | 3.43 | 14.12 % |
| 1988 | 4.10 | 19.59 % |
| 1989 | 4.13 | 0.86 % |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 2.87 | NA |
| 1994 | 1.34 | -53.24 % |
| 1995 | 1.23 | -8.21 % |
| 1996 | 1.34 | 9.10 % |
| 1997 | 1.31 | -2.63 % |
| 1998 | 1.17 | -10.81 % |
| 1999 | .07 | -93.94 % |
| 2000 | 1.27 | 1,700.00 % |
| 2001 | 1.24 | -2.78 % |
| 2002 | 1.31 | 5.71 % |
| 2003 | .95 | -27.03 % |
| 2004 | .88 | -7.41 % |
| 2005 | .57 | -36.00 % |
| 2006 | .81 | 43.75 % |
| 2007 | .74 | -8.70 % |
| 2008 | .49 | -33.33 % |
| 2009 | .39 | -21.43 % |
| 2010 | .25 | -36.36 % |
| 2011 | .21 | -14.29 % |
|
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