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| year | production | change |
| 1980 | 1.00 | NA |
| 1981 | 1.20 | 20.00% |
| 1982 | 1.50 | 25.00% |
| 1983 | 1.80 | 20.00% |
| 1984 | 2.10 | 16.67% |
| 1985 | 2.30 | 9.52% |
| 1986 | 2.80 | 21.74% |
| 1987 | 2.50 | -10.71% |
| 1988 | 2.50 | 0.00% |
| 1989 | 3.20 | 28.00% |
| 1990 | 3.40 | 6.25% |
| 1991 | 3.50 | 2.94% |
| 1992 | 4.20 | 20.00% |
| 1993 | 4.50 | 7.14% |
| 1994 | 4.80 | 6.67% |
| 1995 | 5.30 | 10.42% |
| 1996 | 5.70 | 7.55% |
| 1997 | 5.90 | 3.51% |
| 1998 | 6.30 | 6.78% |
| 1999 | 6.70 | 6.35% |
| 2000 | 6.90 | 2.99% |
| 2001 | 7.10 | 2.90% |
| 2002 | 7.60 | 7.04% |
| 2003 | 7.50 | -1.32% |
| 2004 | 8.40 | 12.00% |
| 2005 | 9.10 | 8.33% |
| 2006 | 10.00 | 9.89% |
| 2007 | 12.00 | 20.00% |
| 2008 | 13.00 | 8.33% |
| 2009 | 13.00 | 0.00% |
| 2010 | 14.00 | 7.69% |
| 2011 | 14.00 | 0.00% |
| 2012 | 16.00 | 14.29% |
| 2013 | 16.00 | 0.00% |
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