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| year | production | change |
| 1980 | 9.20 | NA |
| 1981 | 9.80 | 6.52% |
| 1982 | 10.00 | 2.04% |
| 1983 | 10.00 | 0.00% |
| 1984 | 9.90 | -1.00% |
| 1985 | 10.00 | 1.01% |
| 1986 | 9.80 | -2.00% |
| 1987 | 8.50 | -13.27% |
| 1988 | 8.40 | -1.18% |
| 1989 | 6.80 | -19.05% |
| 1990 | 7.80 | 14.71% |
| 1991 | 7.80 | 0.00% |
| 1992 | 7.70 | -1.28% |
| 1993 | 7.70 | 0.00% |
| 1994 | 7.70 | 0.00% |
| 1995 | 7.80 | 1.30% |
| 1996 | 7.10 | -8.97% |
| 1997 | 7.90 | 11.27% |
| 1998 | 7.50 | -5.06% |
| 1999 | 7.70 | 2.67% |
| 2000 | 7.70 | 0.00% |
| 2001 | 7.90 | 2.60% |
| 2002 | 8.10 | 2.53% |
| 2003 | 8.20 | 1.23% |
| 2004 | 8.40 | 2.44% |
| 2005 | 8.80 | 4.76% |
| 2006 | 9.60 | 9.09% |
| 2007 | 9.60 | 0.00% |
| 2008 | 9.50 | -1.04% |
| 2009 | 9.80 | 3.16% |
| 2010 | 10.00 | 2.04% |
| 2011 | 11.00 | 10.00% |
| 2012 | 12.00 | 9.09% |
| 2013 | 13.00 | 8.33% |
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