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| year | production | change |
| 1980 | 2.10 | NA |
| 1981 | 2.30 | 9.52% |
| 1982 | 2.40 | 4.35% |
| 1983 | 2.90 | 20.83% |
| 1984 | 3.00 | 3.45% |
| 1985 | 2.80 | -6.67% |
| 1986 | 2.90 | 3.57% |
| 1987 | 3.10 | 6.90% |
| 1988 | 3.10 | 0.00% |
| 1989 | 3.30 | 6.45% |
| 1990 | 3.40 | 3.03% |
| 1991 | 3.80 | 11.76% |
| 1992 | 4.60 | 21.05% |
| 1993 | 4.90 | 6.52% |
| 1994 | 5.20 | 6.12% |
| 1995 | 4.80 | -7.69% |
| 1996 | 4.70 | -2.08% |
| 1997 | 5.60 | 19.15% |
| 1998 | 5.30 | -5.36% |
| 1999 | 6.10 | 15.09% |
| 2000 | 6.80 | 11.48% |
| 2001 | 6.90 | 1.47% |
| 2002 | 7.40 | 7.25% |
| 2003 | 7.30 | -1.35% |
| 2004 | 8.00 | 9.59% |
| 2005 | 8.20 | 2.50% |
| 2006 | 8.60 | 4.88% |
| 2007 | 8.90 | 3.49% |
| 2008 | 9.40 | 5.62% |
| 2009 | 9.20 | -2.13% |
| 2010 | 9.50 | 3.26% |
| 2011 | 9.70 | 2.11% |
| 2012 | 10.00 | 3.09% |
| 2013 | 10.00 | 0.00% |
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