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| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.70 | 6.25% |
| 1982 | 1.80 | 5.88% |
| 1983 | 1.60 | -11.11% |
| 1984 | 1.80 | 12.50% |
| 1985 | 1.80 | 0.00% |
| 1986 | 1.70 | -5.56% |
| 1987 | 1.90 | 11.76% |
| 1988 | 2.00 | 5.26% |
| 1989 | 2.10 | 5.00% |
| 1990 | 2.00 | -4.76% |
| 1991 | 1.90 | -5.00% |
| 1992 | 2.00 | 5.26% |
| 1993 | 2.40 | 20.00% |
| 1994 | 2.80 | 16.67% |
| 1995 | 3.30 | 17.86% |
| 1996 | 3.30 | 0.00% |
| 1997 | 3.50 | 6.06% |
| 1998 | 3.70 | 5.71% |
| 1999 | 3.70 | 0.00% |
| 2000 | 3.70 | 0.00% |
| 2001 | 3.80 | 2.70% |
| 2002 | 4.00 | 5.26% |
| 2003 | 4.30 | 7.50% |
| 2004 | 4.30 | 0.00% |
| 2005 | 4.70 | 9.30% |
| 2006 | 5.60 | 19.15% |
| 2007 | 5.70 | 1.79% |
| 2008 | 6.00 | 5.26% |
| 2009 | 5.80 | -3.33% |
| 2010 | 6.10 | 5.17% |
| 2011 | 6.00 | -1.64% |
| 2012 | 6.20 | 3.33% |
| 2013 | 6.10 | -1.61% |
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