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| year | production | change |
| 1980 | .22 | NA |
| 1981 | .24 | 7.73% |
| 1982 | .24 | 2.53% |
| 1983 | .25 | 3.29% |
| 1984 | .24 | -3.59% |
| 1985 | .27 | 11.98% |
| 1986 | .30 | 8.86% |
| 1987 | .33 | 12.20% |
| 1988 | .30 | -10.27% |
| 1989 | .30 | 1.01% |
| 1990 | .31 | 4.33% |
| 1991 | .33 | 6.39% |
| 1992 | .29 | -13.81% |
| 1993 | .35 | 22.30% |
| 1994 | .35 | -0.85% |
| 1995 | .34 | -1.44% |
| 1996 | .33 | -2.62% |
| 1997 | .40 | 19.46% |
| 1998 | .40 | 1.00% |
| 1999 | .41 | 1.24% |
| 2000 | .42 | 1.72% |
| 2001 | .43 | 2.41% |
| 2002 | .45 | 4.71% |
| 2003 | .45 | 1.57% |
| 2004 | .46 | 1.11% |
| 2005 | .48 | 4.38% |
| 2006 | .50 | 4.82% |
| 2007 | .52 | 3.40% |
| 2008 | .54 | 4.45% |
| 2009 | .54 | 0.37% |
| 2010 | .55 | 1.29% |
| 2011 | .55 | -0.73% |
| 2012 | .61 | 12.29% |
| 2013 | .70 | 14.22% |
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