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| year | production | change |
| 1986 | 3.30 | NA |
| 1987 | 3.50 | 6.06% |
| 1988 | 4.30 | 22.86% |
| 1989 | 3.60 | -16.28% |
| 1990 | 4.10 | 13.89% |
| 1991 | 2.30 | -43.90% |
| 1992 | 4.20 | 82.61% |
| 1993 | 4.00 | -4.76% |
| 1994 | 6.00 | 50.00% |
| 1995 | 5.80 | -3.33% |
| 1996 | 6.00 | 3.45% |
| 1997 | 4.90 | -18.33% |
| 1998 | 6.20 | 26.53% |
| 1999 | 7.90 | 27.42% |
| 2000 | 8.00 | 1.27% |
| 2001 | 8.00 | 0.00% |
| 2002 | 7.70 | -3.75% |
| 2003 | 9.50 | 23.38% |
| 2004 | 9.60 | 1.05% |
| 2005 | 7.30 | -23.96% |
| 2006 | 2.40 | -67.12% |
| 2007 | 6.90 | 187.50% |
| 2008 | 8.40 | 21.74% |
| 2009 | 6.70 | -20.24% |
| 2010 | 5.90 | -11.94% |
| 2011 | 6.70 | 13.56% |
| 2012 | 8.40 | 25.37% |
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