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| year | production | change |
| 1980 | 1.50 | NA |
| 1981 | 1.50 | 0.00% |
| 1982 | 1.40 | -6.67% |
| 1983 | 1.70 | 21.43% |
| 1984 | 2.10 | 23.53% |
| 1985 | 2.50 | 19.05% |
| 1986 | 2.80 | 12.00% |
| 1987 | 3.00 | 7.14% |
| 1988 | 3.10 | 3.33% |
| 1989 | 3.40 | 9.68% |
| 1990 | 3.10 | -8.82% |
| 1991 | 3.00 | -3.23% |
| 1992 | 2.80 | -6.67% |
| 1993 | 2.40 | -14.29% |
| 1994 | 2.60 | 8.33% |
| 1995 | 2.50 | -3.85% |
| 1996 | 2.50 | 0.00% |
| 1997 | 2.50 | 0.00% |
| 1998 | 2.50 | 0.00% |
| 1999 | 2.70 | 8.00% |
| 2000 | 2.80 | 3.70% |
| 2001 | 2.90 | 3.57% |
| 2002 | 3.00 | 3.45% |
| 2003 | 3.00 | 0.00% |
| 2004 | 3.20 | 6.67% |
| 2005 | 3.30 | 3.13% |
| 2006 | 3.40 | 3.03% |
| 2007 | 3.60 | 5.88% |
| 2008 | 3.90 | 8.33% |
| 2009 | 3.90 | 0.00% |
| 2010 | 4.10 | 5.13% |
| 2011 | 4.30 | 4.88% |
| 2012 | 4.50 | 4.65% |
| 2013 | 4.60 | 2.22% |
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