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| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.80 | 12.50% |
| 1982 | 2.00 | 11.11% |
| 1983 | 2.00 | 0.00% |
| 1984 | 2.20 | 10.00% |
| 1985 | 2.40 | 9.09% |
| 1986 | 2.60 | 8.33% |
| 1987 | 2.70 | 3.85% |
| 1988 | 2.80 | 3.70% |
| 1989 | 2.80 | 0.00% |
| 1990 | 3.10 | 10.71% |
| 1991 | 3.30 | 6.45% |
| 1992 | 3.20 | -3.03% |
| 1993 | 3.90 | 21.88% |
| 1994 | 4.30 | 10.26% |
| 1995 | 4.70 | 9.30% |
| 1996 | 4.40 | -6.38% |
| 1997 | 5.00 | 13.64% |
| 1998 | 5.50 | 10.00% |
| 1999 | 6.00 | 9.09% |
| 2000 | 6.50 | 8.33% |
| 2001 | 6.50 | 0.00% |
| 2002 | 6.80 | 4.62% |
| 2003 | 7.40 | 8.82% |
| 2004 | 7.90 | 6.76% |
| 2005 | 8.90 | 12.66% |
| 2006 | 8.40 | -5.62% |
| 2007 | 9.50 | 13.10% |
| 2008 | 9.60 | 1.05% |
| 2009 | 9.60 | 0.00% |
| 2010 | 10.00 | 4.17% |
| 2011 | 11.00 | 10.00% |
| 2012 | 11.00 | 0.00% |
| 2013 | 12.00 | 9.09% |
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