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| year | production | change |
| 1986 | 3.10 | NA |
| 1987 | 4.00 | 29.03% |
| 1988 | 5.10 | 27.50% |
| 1989 | 4.20 | -17.65% |
| 1990 | 5.00 | 19.05% |
| 1991 | 4.20 | -16.00% |
| 1992 | 3.80 | -9.52% |
| 1993 | 4.30 | 13.16% |
| 1994 | 4.40 | 2.33% |
| 1995 | 4.40 | 0.00% |
| 1996 | 4.30 | -2.27% |
| 1997 | 4.80 | 11.63% |
| 1998 | 4.70 | -2.08% |
| 1999 | 4.40 | -6.38% |
| 2000 | 4.60 | 4.55% |
| 2001 | 4.40 | -4.35% |
| 2002 | 4.90 | 11.36% |
| 2003 | 6.10 | 24.49% |
| 2004 | 6.30 | 3.28% |
| 2005 | 5.40 | -14.29% |
| 2006 | 1.90 | -64.81% |
| 2007 | 4.40 | 131.58% |
| 2008 | 4.40 | 0.00% |
| 2009 | 3.70 | -15.91% |
| 2010 | 2.50 | -32.43% |
| 2011 | 3.40 | 36.00% |
| 2012 | 3.90 | 14.71% |
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