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| year | production | change |
| 1980 | .15 | NA |
| 1981 | .14 | -8.11% |
| 1982 | .15 | 11.76% |
| 1983 | .15 | -0.66% |
| 1984 | .16 | 3.97% |
| 1985 | .15 | -3.82% |
| 1986 | .15 | -1.99% |
| 1987 | .15 | 0.00% |
| 1988 | .16 | 6.76% |
| 1989 | .17 | 6.96% |
| 1990 | .17 | 0.59% |
| 1991 | .17 | -0.59% |
| 1992 | .18 | 5.33% |
| 1993 | .17 | -2.81% |
| 1994 | .18 | 1.73% |
| 1995 | .20 | 11.93% |
| 1996 | .20 | 2.03% |
| 1997 | .21 | 1.99% |
| 1998 | .21 | 2.93% |
| 1999 | .19 | -11.85% |
| 2000 | .22 | 16.13% |
| 2001 | .28 | 28.24% |
| 2002 | .32 | 15.88% |
| 2003 | .36 | 13.08% |
| 2004 | .51 | 39.12% |
| 2005 | .59 | 17.03% |
| 2006 | .62 | 4.91% |
| 2007 | .66 | 5.81% |
| 2008 | .66 | 0.30% |
| 2009 | .57 | -13.07% |
| 2010 | .64 | 11.71% |
| 2011 | .70 | 8.92% |
| 2012 | .80 | 15.23% |
| 2013 | .91 | 13.22% |
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