1952

7.9

1979

7.3

1939

6.4

1997

6.6

1996

6.0

1974

6.9

2008

6.1

1998

6.0

1990

6.0

2019

8.2

1990

7.8

2002

6.8

2008

5.7

2004

6.0

1967

6.5

2007

6.5

2008

6.5

2016

6.5

2008

7.0

1982

6.3