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| year | production | change |
| 1980 | .90 | NA |
| 1981 | 1.00 | 11.11% |
| 1982 | 1.00 | 0.00% |
| 1983 | 1.10 | 10.00% |
| 1984 | 1.00 | -9.09% |
| 1985 | 1.00 | 0.00% |
| 1986 | 1.40 | 40.00% |
| 1987 | 1.30 | -7.14% |
| 1988 | 1.90 | 46.15% |
| 1989 | 2.00 | 5.26% |
| 1990 | 2.30 | 15.00% |
| 1991 | 2.30 | 0.00% |
| 1992 | 2.40 | 4.35% |
| 1993 | 2.50 | 4.17% |
| 1994 | 2.10 | -16.00% |
| 1995 | 2.30 | 9.52% |
| 1996 | 3.00 | 30.43% |
| 1997 | 3.10 | 3.33% |
| 1998 | 3.30 | 6.45% |
| 1999 | 3.10 | -6.06% |
| 2000 | 3.50 | 12.90% |
| 2001 | 3.70 | 5.71% |
| 2002 | 3.90 | 5.41% |
| 2003 | 4.40 | 12.82% |
| 2004 | 4.70 | 6.82% |
| 2005 | 5.40 | 14.89% |
| 2006 | 5.70 | 5.56% |
| 2007 | 6.10 | 7.02% |
| 2008 | 6.30 | 3.28% |
| 2009 | 6.40 | 1.59% |
| 2010 | 6.50 | 1.56% |
| 2011 | 7.30 | 12.31% |
| 2012 | 7.50 | 2.74% |
| 2013 | 7.80 | 4.00% |
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