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| year | production | change |
| 1980 | 1.20 | NA |
| 1981 | 1.05 | -12.33% |
| 1982 | .93 | -11.41% |
| 1983 | .84 | -9.98% |
| 1984 | 1.09 | 30.04% |
| 1985 | .88 | -19.71% |
| 1986 | .88 | 0.68% |
| 1987 | .86 | -2.72% |
| 1988 | .99 | 15.38% |
| 1989 | 1.06 | 7.07% |
| 1990 | 1.20 | 13.21% |
| 1991 | 1.25 | 3.75% |
| 1992 | 1.39 | 11.73% |
| 1993 | 1.45 | 3.95% |
| 1994 | 1.44 | -0.21% |
| 1995 | 1.51 | 4.44% |
| 1996 | 1.66 | 9.82% |
| 1997 | 1.90 | 14.80% |
| 1998 | 2.31 | 21.47% |
| 1999 | 2.37 | 2.73% |
| 2000 | 2.83 | 19.32% |
| 2001 | 2.74 | -3.00% |
| 2002 | 2.81 | 2.30% |
| 2003 | 3.14 | 11.86% |
| 2004 | 3.70 | 17.87% |
| 2005 | 4.23 | 14.16% |
| 2006 | 4.48 | 5.94% |
| 2007 | 5.11 | 14.14% |
| 2008 | 5.91 | 15.62% |
| 2009 | 6.56 | 11.12% |
| 2010 | 8.10 | 23.42% |
| 2011 | 9.53 | 17.62% |
| 2012 | 9.55 | 0.27% |
| 2013 | 9.62 | 0.71% |
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