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| year | production | change |
| 1980 | .23 | NA |
| 1981 | .34 | 47.83% |
| 1982 | .39 | 14.71% |
| 1983 | .30 | -23.08% |
| 1984 | .49 | 63.33% |
| 1985 | .25 | -48.98% |
| 1986 | .41 | 64.00% |
| 1987 | .29 | -29.27% |
| 1988 | .51 | 75.86% |
| 1989 | .52 | 1.96% |
| 1990 | .23 | -55.77% |
| 1991 | .21 | -8.70% |
| 1992 | .28 | 33.33% |
| 1993 | .27 | -3.57% |
| 1994 | .30 | 11.11% |
| 1995 | .39 | 30.00% |
| 1996 | .50 | 28.21% |
| 1997 | .50 | 0.00% |
| 1998 | .56 | 12.00% |
| 1999 | .49 | -12.50% |
| 2000 | .52 | 6.12% |
| 2001 | .52 | 0.00% |
| 2002 | .52 | 0.00% |
| 2003 | .52 | 0.00% |
| 2004 | .54 | 3.85% |
| 2005 | .57 | 5.56% |
| 2006 | .62 | 8.77% |
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