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| year | production | change |
| 1980 | 1.90 | NA |
| 1981 | 1.60 | -15.79% |
| 1982 | 1.60 | 0.00% |
| 1983 | 1.60 | 0.00% |
| 1984 | 1.60 | 0.00% |
| 1985 | 1.60 | 0.00% |
| 1986 | 1.90 | 18.75% |
| 1987 | 2.00 | 5.26% |
| 1988 | 2.20 | 10.00% |
| 1989 | 2.40 | 9.09% |
| 1990 | 2.60 | 8.33% |
| 1991 | 2.80 | 7.69% |
| 1992 | 2.80 | 0.00% |
| 1993 | 2.90 | 3.57% |
| 1994 | 3.10 | 6.90% |
| 1995 | 3.40 | 9.68% |
| 1996 | 3.30 | -2.94% |
| 1997 | 3.40 | 3.03% |
| 1998 | 4.30 | 26.47% |
| 1999 | 5.20 | 20.93% |
| 2000 | 6.00 | 15.38% |
| 2001 | 5.80 | -3.33% |
| 2002 | 6.10 | 5.17% |
| 2003 | 7.60 | 24.59% |
| 2004 | 6.70 | -11.84% |
| 2005 | 8.30 | 23.88% |
| 2006 | 8.30 | 0.00% |
| 2007 | 9.00 | 8.43% |
| 2008 | 8.40 | -6.67% |
| 2009 | 8.70 | 3.57% |
| 2010 | 8.70 | 0.00% |
| 2011 | 8.90 | 2.30% |
| 2012 | 9.20 | 3.37% |
| 2013 | 9.70 | 5.43% |
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