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| year | production | change |
| 1986 | 3.90 | NA |
| 1987 | 5.00 | 28.21% |
| 1988 | 1.50 | -70.00% |
| 1989 | 3.10 | 106.67% |
| 1990 | 4.20 | 35.48% |
| 1991 | 3.20 | -23.81% |
| 1992 | 4.60 | 43.75% |
| 1993 | 3.20 | -30.43% |
| 1994 | 3.60 | 12.50% |
| 1995 | 3.90 | 8.33% |
| 1996 | 5.40 | 38.46% |
| 1997 | 5.60 | 3.70% |
| 1998 | 5.90 | 5.36% |
| 1999 | 2.90 | -50.85% |
| 2000 | 3.80 | 31.03% |
| 2001 | 3.50 | -7.89% |
| 2002 | 5.00 | 42.86% |
| 2003 | 3.20 | -36.00% |
| 2004 | 1.70 | -46.88% |
| 2005 | 1.80 | 5.88% |
| 2006 | 4.60 | 155.56% |
| 2007 | 3.90 | -15.22% |
| 2008 | 5.40 | 38.46% |
| 2009 | 3.50 | -35.19% |
| 2010 | 3.90 | 11.43% |
| 2011 | 4.30 | 10.26% |
| 2012 | 4.50 | 4.65% |
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