|
| year | production | change |
| 1980 | 1.38 | NA |
| 1981 | 1.13 | -17.95 % |
| 1982 | 1.09 | -3.12 % |
| 1983 | .64 | -41.94 % |
| 1984 | 1.31 | 105.55 % |
| 1985 | 1.41 | 8.11 % |
| 1986 | .92 | -35.00 % |
| 1987 | .99 | 7.69 % |
| 1988 | .60 | -39.29 % |
| 1989 | .49 | -17.65 % |
| 1990 | .42 | -15.05 % |
| 1991 | .32 | -24.29 % |
| 1992 | .21 | -33.33 % |
| 1993 | .14 | -33.35 % |
| 1994 | .04 | -71.69 % |
| 1995 | | NA |
| 1996 | .07 | NA |
| 1997 | | NA |
| 1998 | | NA |
| 1999 | | NA |
| 2000 | .07 | NA |
| 2001 | | NA |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | | NA |
| 2008 | | NA |
| 2009 | | NA |
| 2010 | | NA |
| 2011 | | NA |
|
|
