|
| year | production | change |
| 1980 | 48.00 | NA |
| 1981 | 46.00 | -4.17 % |
| 1982 | 44.00 | -4.35 % |
| 1983 | 42.00 | -4.55 % |
| 1984 | 41.00 | -2.38 % |
| 1985 | 42.00 | 2.44 % |
| 1986 | 44.00 | 4.76 % |
| 1987 | 42.00 | -4.55 % |
| 1988 | 43.00 | 2.38 % |
| 1989 | 43.00 | 0.00 % |
| 1990 | 42.00 | -2.33 % |
| 1991 | 38.00 | -9.52 % |
| 1992 | 36.74 | -3.31 % |
| 1993 | 40.75 | 10.91 % |
| 1994 | 40.80 | 0.12 % |
| 1995 | 40.78 | -0.05 % |
| 1996 | 35.00 | -14.17 % |
| 1997 | 40.30 | 15.14 % |
| 1998 | 37.68 | -6.51 % |
| 1999 | 37.44 | -0.63 % |
| 2000 | 38.00 | 1.50 % |
| 2001 | 37.00 | -2.63 % |
| 2002 | 36.80 | -0.54 % |
| 2003 | 37.63 | 2.26 % |
| 2004 | 37.00 | -1.68 % |
| 2005 | 35.00 | -5.41 % |
| 2006 | 35.00 | 0.00 % |
| 2007 | 35.00 | 0.00 % |
| 2008 | 35.00 | 0.00 % |
| 2009 | 35.00 | 0.00 % |
| 2010 | 35.00 | 0.00 % |
| 2011 | 35.00 | 0.00 % |
| 2012 | 35.00 | 0.00 % |
|
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