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| year | production | change |
| 1986 | 3.10 | NA |
| 1987 | 3.40 | 9.68% |
| 1988 | 3.30 | -2.94% |
| 1989 | 3.00 | -9.09% |
| 1990 | 2.80 | -6.67% |
| 1991 | 3.10 | 10.71% |
| 1992 | 3.50 | 12.90% |
| 1993 | 4.60 | 31.43% |
| 1994 | 5.60 | 21.74% |
| 1995 | 3.70 | -33.93% |
| 1996 | 4.60 | 24.32% |
| 1997 | 3.50 | -23.91% |
| 1998 | 3.10 | -11.43% |
| 1999 | 3.10 | 0.00% |
| 2000 | 3.20 | 3.23% |
| 2001 | 2.90 | -9.38% |
| 2002 | 3.00 | 3.45% |
| 2003 | 3.20 | 6.67% |
| 2004 | 3.30 | 3.13% |
| 2005 | 3.40 | 3.03% |
| 2006 | 2.50 | -26.47% |
| 2007 | 2.70 | 8.00% |
| 2008 | 2.60 | -3.70% |
| 2009 | 2.50 | -3.85% |
| 2010 | 2.30 | -8.00% |
| 2011 | 2.20 | -4.35% |
| 2012 | 1.70 | -22.73% |
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