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| year | production | change |
| 1986 | 5.00 | NA |
| 1987 | 5.30 | 6.00% |
| 1988 | 5.60 | 5.66% |
| 1989 | 5.90 | 5.36% |
| 1990 | 6.10 | 3.39% |
| 1991 | 4.00 | -34.43% |
| 1992 | 6.70 | 67.50% |
| 1993 | 6.80 | 1.49% |
| 1994 | 7.50 | 10.29% |
| 1995 | 7.10 | -5.33% |
| 1996 | 7.60 | 7.04% |
| 1997 | 7.90 | 3.95% |
| 1998 | 8.10 | 2.53% |
| 1999 | 6.80 | -16.05% |
| 2000 | 8.90 | 30.88% |
| 2001 | 9.30 | 4.49% |
| 2002 | 5.50 | -40.86% |
| 2003 | 6.10 | 10.91% |
| 2004 | 5.20 | -14.75% |
| 2005 | 5.60 | 7.69% |
| 2006 | 4.20 | -25.00% |
| 2007 | 3.30 | -21.43% |
| 2008 | 3.00 | -9.09% |
| 2009 | 2.90 | -3.33% |
| 2010 | .40 | -86.21% |
| 2011 | .00 | -100.00% |
| 2012 | .00 | NA |
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