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| year | production | change |
| 1980 | 2.30 | NA |
| 1981 | 2.60 | 13.04% |
| 1982 | 2.90 | 11.54% |
| 1983 | 3.10 | 6.90% |
| 1984 | 3.30 | 6.45% |
| 1985 | 3.70 | 12.12% |
| 1986 | 4.00 | 8.11% |
| 1987 | 4.20 | 5.00% |
| 1988 | 4.20 | 0.00% |
| 1989 | 4.40 | 4.76% |
| 1990 | 4.50 | 2.27% |
| 1991 | 4.40 | -2.22% |
| 1992 | 4.80 | 9.09% |
| 1993 | 5.20 | 8.33% |
| 1994 | 5.50 | 5.77% |
| 1995 | 5.60 | 1.82% |
| 1996 | 6.20 | 10.71% |
| 1997 | 6.50 | 4.84% |
| 1998 | 7.60 | 16.92% |
| 1999 | 8.40 | 10.53% |
| 2000 | 8.60 | 2.38% |
| 2001 | 9.40 | 9.30% |
| 2002 | 10.00 | 6.38% |
| 2003 | 11.00 | 10.00% |
| 2004 | 12.00 | 9.09% |
| 2005 | 14.00 | 16.67% |
| 2006 | 16.00 | 14.29% |
| 2007 | 18.00 | 12.50% |
| 2008 | 20.00 | 11.11% |
| 2009 | 23.00 | 15.00% |
| 2010 | 26.00 | 13.04% |
| 2011 | 29.00 | 11.54% |
| 2012 | 33.00 | 13.79% |
| 2013 | 33.00 | 0.00% |
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