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| year | production | change |
| 1980 | 22.00 | NA |
| 1981 | 23.00 | 4.55% |
| 1982 | 25.00 | 8.70% |
| 1983 | 25.00 | 0.00% |
| 1984 | 28.00 | 12.00% |
| 1985 | 31.00 | 10.71% |
| 1986 | 33.00 | 6.45% |
| 1987 | 33.00 | 0.00% |
| 1988 | 35.00 | 6.06% |
| 1989 | 35.00 | 0.00% |
| 1990 | 35.00 | 0.00% |
| 1991 | 35.00 | 0.00% |
| 1992 | 27.00 | -22.86% |
| 1993 | 26.00 | -3.70% |
| 1994 | 26.00 | 0.00% |
| 1995 | 26.00 | 0.00% |
| 1996 | 24.00 | -7.69% |
| 1997 | 22.00 | -8.33% |
| 1998 | 21.00 | -4.55% |
| 1999 | 18.00 | -14.29% |
| 2000 | 19.00 | 5.56% |
| 2001 | 20.00 | 5.26% |
| 2002 | 19.00 | -5.00% |
| 2003 | 20.00 | 5.26% |
| 2004 | 21.00 | 5.00% |
| 2005 | 22.00 | 4.76% |
| 2006 | 22.00 | 0.00% |
| 2007 | 21.00 | -4.55% |
| 2008 | 23.00 | 9.52% |
| 2009 | 20.00 | -13.04% |
| 2010 | 21.00 | 5.00% |
| 2011 | 19.00 | -9.52% |
| 2012 | 19.00 | 0.00% |
| 2013 | 19.00 | 0.00% |
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