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| year | production | change |
| 1980 | 3.10 | NA |
| 1981 | 3.30 | 6.45% |
| 1982 | 3.60 | 9.09% |
| 1983 | 3.80 | 5.56% |
| 1984 | 3.90 | 2.63% |
| 1985 | 3.90 | 0.00% |
| 1986 | 4.10 | 5.13% |
| 1987 | 4.20 | 2.44% |
| 1988 | 4.40 | 4.76% |
| 1989 | 4.50 | 2.27% |
| 1990 | 4.50 | 0.00% |
| 1991 | 4.50 | 0.00% |
| 1992 | 4.50 | 0.00% |
| 1993 | 4.70 | 4.44% |
| 1994 | 4.70 | 0.00% |
| 1995 | 4.90 | 4.26% |
| 1996 | 5.10 | 4.08% |
| 1997 | 5.50 | 7.84% |
| 1998 | 6.20 | 12.73% |
| 1999 | 7.10 | 14.52% |
| 2000 | 7.60 | 7.04% |
| 2001 | 8.00 | 5.26% |
| 2002 | 8.30 | 3.75% |
| 2003 | 8.40 | 1.20% |
| 2004 | 8.60 | 2.38% |
| 2005 | 8.60 | 0.00% |
| 2006 | 9.90 | 15.12% |
| 2007 | 12.00 | 21.21% |
| 2008 | 16.00 | 33.33% |
| 2009 | 17.00 | 6.25% |
| 2010 | 17.00 | 0.00% |
| 2011 | 17.00 | 0.00% |
| 2012 | 17.00 | 0.00% |
| 2013 | 17.00 | 0.00% |
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