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| year | production | change |
| 1986 | 7.80 | NA |
| 1987 | 7.90 | 1.28% |
| 1988 | 7.60 | -3.80% |
| 1989 | 8.50 | 11.84% |
| 1990 | 7.80 | -8.24% |
| 1991 | 7.70 | -1.28% |
| 1992 | 8.10 | 5.19% |
| 1993 | 7.70 | -4.94% |
| 1994 | 7.70 | 0.00% |
| 1995 | 7.10 | -7.79% |
| 1996 | 7.20 | 1.41% |
| 1997 | 6.40 | -11.11% |
| 1998 | 6.90 | 7.81% |
| 1999 | 6.80 | -1.45% |
| 2000 | 7.80 | 14.71% |
| 2001 | 6.40 | -17.95% |
| 2002 | 5.90 | -7.81% |
| 2003 | 6.10 | 3.39% |
| 2004 | 6.40 | 4.92% |
| 2005 | 6.30 | -1.56% |
| 2006 | 4.20 | -33.33% |
| 2007 | 4.80 | 14.29% |
| 2008 | 4.30 | -10.42% |
| 2009 | 3.70 | -13.95% |
| 2010 | 4.20 | 13.51% |
| 2011 | 4.20 | 0.00% |
| 2012 | 2.70 | -35.71% |
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