|
| year | production | change |
| 1980 | 2.47 | NA |
| 1981 | 2.12 | -14.17 % |
| 1982 | | NA |
| 1983 | 5.30 | NA |
| 1984 | 5.30 | 0.00 % |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | 4.10 | NA |
| 1988 | 3.53 | -13.90 % |
| 1989 | 3.18 | -9.92 % |
| 1990 | | NA |
| 1991 | 3.55 | NA |
| 1992 | 3.53 | -0.48 % |
| 1993 | 3.53 | 0.00 % |
| 1994 | 3.53 | -0.04 % |
| 1995 | 3.53 | 0.00 % |
| 1996 | 3.53 | 0.04 % |
| 1997 | 3.53 | 0.00 % |
| 1998 | 3.53 | 0.00 % |
| 1999 | 3.53 | 0.00 % |
| 2000 | 2.83 | -20.00 % |
| 2001 | 2.83 | 0.00 % |
| 2002 | 3.18 | 12.50 % |
| 2003 | 3.18 | 0.00 % |
| 2004 | 3.53 | 11.11 % |
| 2005 | 3.53 | 0.00 % |
| 2006 | 3.53 | 0.00 % |
| 2007 | 2.83 | -20.00 % |
| 2008 | 2.83 | 0.00 % |
| 2009 | 2.83 | 0.00 % |
| 2010 | 2.83 | 0.00 % |
| 2011 | 2.47 | -12.50 % |
|
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