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| year | production | change |
| 1986 | 6.90 | NA |
| 1987 | 7.20 | 4.35% |
| 1988 | 7.20 | 0.00% |
| 1989 | 7.20 | 0.00% |
| 1990 | 8.50 | 18.06% |
| 1991 | 6.00 | -29.41% |
| 1992 | 5.10 | -15.00% |
| 1993 | 5.40 | 5.88% |
| 1994 | 6.90 | 27.78% |
| 1995 | 6.60 | -4.35% |
| 1996 | 6.10 | -7.58% |
| 1997 | 7.10 | 16.39% |
| 1998 | 7.10 | 0.00% |
| 1999 | 7.20 | 1.41% |
| 2000 | 7.50 | 4.17% |
| 2001 | 7.70 | 2.67% |
| 2002 | 5.40 | -29.87% |
| 2003 | 6.80 | 25.93% |
| 2004 | 9.40 | 38.24% |
| 2005 | 9.20 | -2.13% |
| 2006 | 8.30 | -9.78% |
| 2007 | 9.10 | 9.64% |
| 2008 | 9.30 | 2.20% |
| 2009 | 8.20 | -11.83% |
| 2010 | 9.00 | 9.76% |
| 2011 | 8.70 | -3.33% |
| 2012 | 8.50 | -2.30% |
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