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| year | production | change |
| 1980 | 2.60 | NA |
| 1981 | 2.70 | 3.85% |
| 1982 | 2.80 | 3.70% |
| 1983 | 2.80 | 0.00% |
| 1984 | 2.80 | 0.00% |
| 1985 | 2.70 | -3.57% |
| 1986 | 2.80 | 3.70% |
| 1987 | 2.90 | 3.57% |
| 1988 | 2.80 | -3.45% |
| 1989 | 2.50 | -10.71% |
| 1990 | 2.40 | -4.00% |
| 1991 | 2.80 | 16.67% |
| 1992 | 3.40 | 21.43% |
| 1993 | 4.50 | 32.35% |
| 1994 | 4.90 | 8.89% |
| 1995 | 5.20 | 6.12% |
| 1996 | 6.60 | 26.92% |
| 1997 | 8.00 | 21.21% |
| 1998 | 7.90 | -1.25% |
| 1999 | 7.70 | -2.53% |
| 2000 | 9.20 | 19.48% |
| 2001 | 9.60 | 4.35% |
| 2002 | 11.00 | 14.58% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 11.00 | -8.33% |
| 2007 | 11.00 | 0.00% |
| 2008 | 13.00 | 18.18% |
| 2009 | 13.00 | 0.00% |
| 2010 | 15.00 | 15.38% |
| 2011 | 15.00 | 0.00% |
| 2012 | 14.00 | -6.67% |
| 2013 | 17.00 | 21.43% |
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