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| year | production | change |
| 1980 | 3.20 | NA |
| 1981 | 3.60 | 12.50% |
| 1982 | 3.30 | -8.33% |
| 1983 | 3.50 | 6.06% |
| 1984 | 4.10 | 17.14% |
| 1985 | 4.30 | 4.88% |
| 1986 | 4.70 | 9.30% |
| 1987 | 4.50 | -4.26% |
| 1988 | 4.30 | -4.44% |
| 1989 | 3.30 | -23.26% |
| 1990 | 3.50 | 6.06% |
| 1991 | 3.70 | 5.71% |
| 1992 | 4.00 | 8.11% |
| 1993 | 5.20 | 30.00% |
| 1994 | 4.80 | -7.69% |
| 1995 | 5.20 | 8.33% |
| 1996 | 6.30 | 21.15% |
| 1997 | 6.80 | 7.94% |
| 1998 | 7.30 | 7.35% |
| 1999 | 8.60 | 17.81% |
| 2000 | 8.10 | -5.81% |
| 2001 | 9.70 | 19.75% |
| 2002 | 12.00 | 23.71% |
| 2003 | 13.00 | 8.33% |
| 2004 | 11.00 | -15.38% |
| 2005 | 12.00 | 9.09% |
| 2006 | 13.00 | 8.33% |
| 2007 | 14.00 | 7.69% |
| 2008 | 12.00 | -14.29% |
| 2009 | 12.00 | 0.00% |
| 2010 | 12.00 | 0.00% |
| 2011 | 13.00 | 8.33% |
| 2012 | 14.00 | 7.69% |
| 2013 | 14.00 | 0.00% |
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