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6.2
1977
6.7
1992
5.1
2005
6.8
7.3
1994
7.2
1982
6.1
1993
6.0
1999
6.3
1997
6.4
5.9
2002
5.0
2006
2007
8.0
1968
8.2
2017
6.9
7.0
2011
10.0
9.7
2009
9.0
2014