1964

7.1

1987

7.5

2009

6.0

1990

7.7

2019

7.7

1924

7.1

1952

6.7

2012

5.2

1942

7.4

1972

7.2

2012

5.8

1948

7.9

2009

7.2

1986

6.3

2010

7.8

1970

7.3

2008

7.0

1997

6.2

1911

6.6

1965

7.4