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| year | production | change |
| 1980 | 1.70 | NA |
| 1981 | 1.90 | 11.76% |
| 1982 | 1.90 | 0.00% |
| 1983 | 2.00 | 5.26% |
| 1984 | 1.60 | -20.00% |
| 1985 | 2.00 | 25.00% |
| 1986 | 2.00 | 0.00% |
| 1987 | 2.40 | 20.00% |
| 1988 | 2.20 | -8.33% |
| 1989 | 2.40 | 9.09% |
| 1990 | 2.20 | -8.33% |
| 1991 | 1.80 | -18.18% |
| 1992 | 1.70 | -5.56% |
| 1993 | 2.10 | 23.53% |
| 1994 | 2.40 | 14.29% |
| 1995 | 3.00 | 25.00% |
| 1996 | 3.10 | 3.33% |
| 1997 | 3.80 | 22.58% |
| 1998 | 3.80 | 0.00% |
| 1999 | 4.60 | 21.05% |
| 2000 | 4.60 | 0.00% |
| 2001 | 4.70 | 2.17% |
| 2002 | 5.10 | 8.51% |
| 2003 | 4.90 | -3.92% |
| 2004 | 5.30 | 8.16% |
| 2005 | 5.40 | 1.89% |
| 2006 | 5.40 | 0.00% |
| 2007 | 5.40 | 0.00% |
| 2008 | 5.60 | 3.70% |
| 2009 | 5.60 | 0.00% |
| 2010 | 5.70 | 1.79% |
| 2011 | 5.80 | 1.75% |
| 2012 | 6.70 | 15.52% |
| 2013 | 7.00 | 4.48% |
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