|
| year | production | change |
| 1980 | 26.00 | NA |
| 1981 | 34.00 | 30.77 % |
| 1982 | 34.00 | 0.00 % |
| 1983 | 35.00 | 2.94 % |
| 1984 | 35.00 | 0.00 % |
| 1985 | 50.00 | 42.86 % |
| 1986 | 60.00 | 20.00 % |
| 1987 | 65.00 | 8.33 % |
| 1988 | 67.00 | 3.08 % |
| 1989 | 65.00 | -2.99 % |
| 1990 | 61.00 | -6.15 % |
| 1991 | 58.67 | -3.83 % |
| 1992 | 57.68 | -1.68 % |
| 1993 | 55.32 | -4.08 % |
| 1994 | 56.15 | 1.50 % |
| 1995 | 50.00 | -10.96 % |
| 1996 | 43.16 | -13.67 % |
| 1997 | 35.67 | -17.37 % |
| 1998 | 34.49 | -3.29 % |
| 1999 | 30.49 | -11.61 % |
| 2000 | 29.00 | -4.88 % |
| 2001 | 27.92 | -3.74 % |
| 2002 | 26.92 | -3.57 % |
| 2003 | 24.08 | -10.55 % |
| 2004 | 23.33 | -3.10 % |
| 2005 | 21.34 | -8.55 % |
| 2006 | 21.50 | 0.76 % |
| 2007 | 19.84 | -7.74 % |
| 2008 | 19.50 | -1.69 % |
| 2009 | 18.15 | -6.92 % |
| 2010 | 18.08 | -0.36 % |
| 2011 | 17.83 | -1.41 % |
| 2012 | 16.25 | -8.85 % |
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