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| year | production | change |
| 1986 | 5.30 | NA |
| 1987 | 7.60 | 43.40% |
| 1988 | 8.60 | 13.16% |
| 1989 | 12.00 | 39.53% |
| 1990 | 12.00 | 0.00% |
| 1991 | 5.10 | -57.50% |
| 1992 | 5.30 | 3.92% |
| 1993 | 5.10 | -3.77% |
| 1994 | 5.30 | 3.92% |
| 1995 | 5.50 | 3.77% |
| 1996 | 5.60 | 1.82% |
| 1997 | 5.80 | 3.57% |
| 1998 | 5.80 | 0.00% |
| 1999 | 5.90 | 1.72% |
| 2000 | 6.30 | 6.78% |
| 2001 | 6.40 | 1.59% |
| 2002 | 6.40 | 0.00% |
| 2003 | 6.80 | 6.25% |
| 2004 | 6.80 | 0.00% |
| 2005 | 6.90 | 1.47% |
| 2006 | 5.70 | -17.39% |
| 2007 | 6.00 | 5.26% |
| 2008 | 6.10 | 1.67% |
| 2009 | 7.60 | 24.59% |
| 2010 | 8.30 | 9.21% |
| 2011 | 2.60 | -68.67% |
| 2012 | 4.10 | 57.69% |
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