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| year | production | change |
| 1980 | 4.40 | NA |
| 1981 | 4.30 | -2.27% |
| 1982 | 4.20 | -2.33% |
| 1983 | 4.60 | 9.52% |
| 1984 | 4.80 | 4.35% |
| 1985 | 5.10 | 6.25% |
| 1986 | 5.30 | 3.92% |
| 1987 | 5.30 | 0.00% |
| 1988 | 5.30 | 0.00% |
| 1989 | 5.90 | 11.32% |
| 1990 | 5.60 | -5.08% |
| 1991 | 5.20 | -7.14% |
| 1992 | 6.00 | 15.38% |
| 1993 | 5.50 | -8.33% |
| 1994 | 5.30 | -3.64% |
| 1995 | 6.10 | 15.09% |
| 1996 | 6.00 | -1.64% |
| 1997 | 5.00 | -16.67% |
| 1998 | 4.70 | -6.00% |
| 1999 | 5.30 | 12.77% |
| 2000 | 5.90 | 11.32% |
| 2001 | 5.90 | 0.00% |
| 2002 | 6.10 | 3.39% |
| 2003 | 6.10 | 0.00% |
| 2004 | 7.00 | 14.75% |
| 2005 | 7.30 | 4.29% |
| 2006 | 7.50 | 2.74% |
| 2007 | 7.80 | 4.00% |
| 2008 | 7.50 | -3.85% |
| 2009 | 7.80 | 4.00% |
| 2010 | 7.80 | 0.00% |
| 2011 | 7.80 | 0.00% |
| 2012 | 7.90 | 1.28% |
| 2013 | 8.50 | 7.59% |
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