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| year | production | change |
| 1980 | 2.00 | NA |
| 1981 | 2.20 | 10.00% |
| 1982 | 2.50 | 13.64% |
| 1983 | 2.70 | 8.00% |
| 1984 | 2.80 | 3.70% |
| 1985 | 2.90 | 3.57% |
| 1986 | 3.10 | 6.90% |
| 1987 | 3.30 | 6.45% |
| 1988 | 3.30 | 0.00% |
| 1989 | 3.30 | 0.00% |
| 1990 | 3.40 | 3.03% |
| 1991 | 3.50 | 2.94% |
| 1992 | 3.70 | 5.71% |
| 1993 | 3.60 | -2.70% |
| 1994 | 3.80 | 5.56% |
| 1995 | 4.10 | 7.89% |
| 1996 | 4.30 | 4.88% |
| 1997 | 4.70 | 9.30% |
| 1998 | 4.90 | 4.26% |
| 1999 | 4.90 | 0.00% |
| 2000 | 5.10 | 4.08% |
| 2001 | 5.30 | 3.92% |
| 2002 | 5.30 | 0.00% |
| 2003 | 6.10 | 15.09% |
| 2004 | 6.00 | -1.64% |
| 2005 | 6.60 | 10.00% |
| 2006 | 6.70 | 1.52% |
| 2007 | 7.20 | 7.46% |
| 2008 | 7.30 | 1.39% |
| 2009 | 7.40 | 1.37% |
| 2010 | 8.00 | 8.11% |
| 2011 | 8.20 | 2.50% |
| 2012 | 8.60 | 4.88% |
| 2013 | 8.90 | 3.49% |
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