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| year | production | change |
| 1992 | .08 | NA |
| 1993 | .07 | -2.63% |
| 1994 | .08 | 2.70% |
| 1995 | .06 | -26.32% |
| 1996 | .06 | 14.29% |
| 1997 | .07 | 7.81% |
| 1998 | .07 | 2.90% |
| 1999 | .07 | 1.41% |
| 2000 | .07 | -8.33% |
| 2001 | .06 | -4.55% |
| 2002 | .07 | 14.29% |
| 2003 | .07 | 0.00% |
| 2004 | .07 | -9.72% |
| 2005 | .07 | 3.08% |
| 2006 | .06 | -17.91% |
| 2007 | .07 | 25.45% |
| 2008 | .07 | 5.80% |
| 2009 | .08 | 5.48% |
| 2010 | .10 | 23.38% |
| 2011 | .08 | -14.74% |
| 2012 | .08 | -7.41% |
| 2013 | .09 | 16.00% |
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