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| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.70 | 6.25% |
| 1982 | 1.70 | 0.00% |
| 1983 | 1.70 | 0.00% |
| 1984 | 1.50 | -11.76% |
| 1985 | 1.50 | 0.00% |
| 1986 | 1.50 | 0.00% |
| 1987 | 1.50 | 0.00% |
| 1988 | 1.90 | 26.67% |
| 1989 | 2.00 | 5.26% |
| 1990 | 2.10 | 5.00% |
| 1991 | 2.30 | 9.52% |
| 1992 | 2.30 | 0.00% |
| 1993 | 2.40 | 4.35% |
| 1994 | 2.70 | 12.50% |
| 1995 | 2.90 | 7.41% |
| 1996 | 3.10 | 6.90% |
| 1997 | 3.30 | 6.45% |
| 1998 | 3.50 | 6.06% |
| 1999 | 3.70 | 5.71% |
| 2000 | 3.80 | 2.70% |
| 2001 | 3.90 | 2.63% |
| 2002 | 4.00 | 2.56% |
| 2003 | 4.20 | 5.00% |
| 2004 | 4.40 | 4.76% |
| 2005 | 4.70 | 6.82% |
| 2006 | 5.10 | 8.51% |
| 2007 | 5.50 | 7.84% |
| 2008 | 5.60 | 1.82% |
| 2009 | 5.90 | 5.36% |
| 2010 | 6.50 | 10.17% |
| 2011 | 6.90 | 6.15% |
| 2012 | 7.30 | 5.80% |
| 2013 | 7.70 | 5.48% |
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