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| year | production | change |
| 1980 | 5.30 | NA |
| 1981 | 5.40 | 1.89% |
| 1982 | 5.00 | -7.41% |
| 1983 | 2.60 | -48.00% |
| 1984 | 1.90 | -26.92% |
| 1985 | 3.10 | 63.16% |
| 1986 | 4.50 | 45.16% |
| 1987 | 4.70 | 4.44% |
| 1988 | 4.90 | 4.26% |
| 1989 | 5.20 | 6.12% |
| 1990 | 5.70 | 9.62% |
| 1991 | 6.10 | 7.02% |
| 1992 | 6.60 | 8.20% |
| 1993 | 6.20 | -6.06% |
| 1994 | 6.10 | -1.61% |
| 1995 | 6.10 | 0.00% |
| 1996 | 6.60 | 8.20% |
| 1997 | 6.80 | 3.03% |
| 1998 | 4.70 | -30.88% |
| 1999 | 5.80 | 23.40% |
| 2000 | 7.10 | 22.41% |
| 2001 | 7.70 | 8.45% |
| 2002 | 7.10 | -7.79% |
| 2003 | 5.70 | -19.72% |
| 2004 | 5.90 | 3.51% |
| 2005 | 6.70 | 13.56% |
| 2006 | 8.20 | 22.39% |
| 2007 | 6.70 | -18.29% |
| 2008 | 8.10 | 20.90% |
| 2009 | 8.80 | 8.64% |
| 2010 | 9.90 | 12.50% |
| 2011 | 11.00 | 11.11% |
| 2012 | 12.00 | 9.09% |
| 2013 | 13.00 | 8.33% |
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