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| year | production | change |
| 1986 | 2.40 | NA |
| 1987 | 4.70 | 95.83% |
| 1988 | 4.30 | -8.51% |
| 1989 | 3.50 | -18.60% |
| 1990 | 6.40 | 82.86% |
| 1991 | 5.50 | -14.06% |
| 1992 | 8.30 | 50.91% |
| 1993 | 2.30 | -72.29% |
| 1994 | 5.40 | 134.78% |
| 1995 | 5.00 | -7.41% |
| 1996 | 6.90 | 38.00% |
| 1997 | 4.20 | -39.13% |
| 1998 | 2.50 | -40.48% |
| 1999 | 4.60 | 84.00% |
| 2000 | .30 | -93.48% |
| 2001 | 3.10 | 933.33% |
| 2002 | 3.90 | 25.81% |
| 2003 | .70 | -82.05% |
| 2004 | .70 | 0.00% |
| 2005 | 1.30 | 85.71% |
| 2006 | .80 | -38.46% |
| 2008 | 2.10 | 162.50% |
| 2009 | 1.00 | -52.38% |
| 2010 | 2.80 | 180.00% |
| 2011 | 4.30 | 53.57% |
| 2012 | 3.40 | -20.93% |
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