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| year | production | change |
| 1980 | 1.40 | NA |
| 1981 | 1.90 | 35.71% |
| 1982 | 2.10 | 10.53% |
| 1983 | 2.10 | 0.00% |
| 1984 | 2.20 | 4.76% |
| 1985 | 2.40 | 9.09% |
| 1986 | 2.40 | 0.00% |
| 1987 | 2.40 | 0.00% |
| 1988 | 2.60 | 8.33% |
| 1989 | 2.70 | 3.85% |
| 1990 | 2.70 | 0.00% |
| 1991 | 2.70 | 0.00% |
| 1992 | 2.70 | 0.00% |
| 1993 | 2.70 | 0.00% |
| 1994 | 2.70 | 0.00% |
| 1995 | 2.80 | 3.70% |
| 1996 | 2.90 | 3.57% |
| 1997 | 3.10 | 6.90% |
| 1998 | 3.10 | 0.00% |
| 1999 | 3.30 | 6.45% |
| 2000 | 3.40 | 3.03% |
| 2001 | 3.50 | 2.94% |
| 2002 | 3.30 | -5.71% |
| 2003 | 3.60 | 9.09% |
| 2004 | 4.10 | 13.89% |
| 2005 | 4.00 | -2.44% |
| 2006 | 5.00 | 25.00% |
| 2007 | 5.10 | 2.00% |
| 2008 | 5.60 | 9.80% |
| 2009 | 5.60 | 0.00% |
| 2010 | 5.80 | 3.57% |
| 2011 | 5.80 | 0.00% |
| 2012 | 6.10 | 5.17% |
| 2013 | 6.70 | 9.84% |
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