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| year | production | change |
| 1980 | 1.60 | NA |
| 1981 | 1.70 | 6.25% |
| 1982 | 1.90 | 11.76% |
| 1983 | 2.10 | 10.53% |
| 1984 | 2.30 | 9.52% |
| 1985 | 2.80 | 21.74% |
| 1986 | 3.00 | 7.14% |
| 1987 | 3.10 | 3.33% |
| 1988 | 3.30 | 6.45% |
| 1989 | 3.30 | 0.00% |
| 1990 | 3.30 | 0.00% |
| 1991 | 3.30 | 0.00% |
| 1992 | 3.70 | 12.12% |
| 1993 | 4.00 | 8.11% |
| 1994 | 4.30 | 7.50% |
| 1995 | 4.30 | 0.00% |
| 1996 | 4.70 | 9.30% |
| 1997 | 4.70 | 0.00% |
| 1998 | 5.40 | 14.89% |
| 1999 | 5.60 | 3.70% |
| 2000 | 5.90 | 5.36% |
| 2001 | 6.40 | 8.47% |
| 2002 | 6.80 | 6.25% |
| 2003 | 7.30 | 7.35% |
| 2004 | 7.90 | 8.22% |
| 2005 | 8.30 | 5.06% |
| 2006 | 9.20 | 10.84% |
| 2007 | 10.00 | 8.70% |
| 2008 | 11.00 | 10.00% |
| 2009 | 11.00 | 0.00% |
| 2010 | 13.00 | 18.18% |
| 2011 | 13.00 | 0.00% |
| 2012 | 13.00 | 0.00% |
| 2013 | 14.00 | 7.69% |
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