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| year | production | change |
| 1980 | .90 | NA |
| 1981 | 1.10 | 22.22% |
| 1982 | 1.50 | 36.36% |
| 1983 | 1.80 | 20.00% |
| 1984 | 2.30 | 27.78% |
| 1985 | 2.70 | 17.39% |
| 1986 | 3.40 | 25.93% |
| 1987 | 3.70 | 8.82% |
| 1988 | 4.10 | 10.81% |
| 1989 | 4.40 | 7.32% |
| 1990 | 4.20 | -4.55% |
| 1991 | 4.30 | 2.38% |
| 1992 | 4.80 | 11.63% |
| 1993 | 5.50 | 14.58% |
| 1994 | 5.80 | 5.45% |
| 1995 | 6.10 | 5.17% |
| 1996 | 6.40 | 4.92% |
| 1997 | 6.90 | 7.81% |
| 1998 | 7.70 | 11.59% |
| 1999 | 7.90 | 2.60% |
| 2000 | 8.60 | 8.86% |
| 2001 | 9.20 | 6.98% |
| 2002 | 9.70 | 5.43% |
| 2003 | 10.00 | 3.09% |
| 2004 | 11.00 | 10.00% |
| 2005 | 12.00 | 9.09% |
| 2006 | 13.00 | 8.33% |
| 2007 | 13.00 | 0.00% |
| 2008 | 15.00 | 15.38% |
| 2009 | 17.00 | 13.33% |
| 2010 | 18.00 | 5.88% |
| 2011 | 20.00 | 11.11% |
| 2012 | 24.00 | 20.00% |
| 2013 | 26.00 | 8.33% |
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