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| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.90 | 18.75% |
| 1982 | 1.90 | 0.00% |
| 1983 | 2.30 | 21.05% |
| 1984 | 2.30 | 0.00% |
| 1985 | 2.60 | 13.04% |
| 1986 | 2.40 | -7.69% |
| 1987 | 2.60 | 8.33% |
| 1988 | 3.00 | 15.38% |
| 1989 | 3.00 | 0.00% |
| 1990 | 3.30 | 10.00% |
| 1991 | 3.40 | 3.03% |
| 1992 | 3.40 | 0.00% |
| 1993 | 3.60 | 5.88% |
| 1994 | 3.60 | 0.00% |
| 1995 | 4.00 | 11.11% |
| 1996 | 4.20 | 5.00% |
| 1997 | 4.40 | 4.76% |
| 1998 | 4.50 | 2.27% |
| 1999 | 4.30 | -4.44% |
| 2000 | 4.10 | -4.65% |
| 2001 | 4.60 | 12.20% |
| 2002 | 4.80 | 4.35% |
| 2003 | 5.10 | 6.25% |
| 2004 | 5.50 | 7.84% |
| 2005 | 5.90 | 7.27% |
| 2006 | 6.30 | 6.78% |
| 2007 | 6.50 | 3.17% |
| 2008 | 6.40 | -1.54% |
| 2009 | 6.60 | 3.13% |
| 2010 | 7.20 | 9.09% |
| 2011 | 7.60 | 5.56% |
| 2012 | 8.00 | 5.26% |
| 2013 | 8.50 | 6.25% |
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