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| year | production | change |
| 1980 | .43 | NA |
| 1981 | .47 | 8.90% |
| 1982 | .51 | 9.25% |
| 1983 | .49 | -4.13% |
| 1984 | .54 | 10.47% |
| 1985 | .62 | 14.31% |
| 1986 | .70 | 13.17% |
| 1987 | .78 | 11.35% |
| 1988 | .80 | 3.23% |
| 1989 | .81 | 1.63% |
| 1990 | .85 | 5.04% |
| 1991 | .87 | 1.99% |
| 1992 | .95 | 8.84% |
| 1993 | .99 | 4.43% |
| 1994 | .95 | -4.14% |
| 1995 | .99 | 3.79% |
| 1996 | 1.05 | 6.09% |
| 1997 | 1.10 | 5.17% |
| 1998 | 1.17 | 6.01% |
| 1999 | 1.06 | -9.18% |
| 2000 | 1.00 | -5.10% |
| 2001 | .90 | -10.66% |
| 2002 | .94 | 5.13% |
| 2003 | .92 | -2.97% |
| 2004 | 1.00 | 9.40% |
| 2005 | 1.07 | 6.39% |
| 2006 | 1.15 | 8.36% |
| 2007 | 1.17 | 1.65% |
| 2008 | 1.19 | 1.71% |
| 2009 | 1.23 | 3.19% |
| 2010 | 1.35 | 9.67% |
| 2011 | 1.39 | 2.96% |
| 2012 | 1.40 | 0.50% |
| 2013 | 1.15 | -17.54% |
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