1964

7.4

1980

7.9

1960

7.5

1987

7.8

2005

7.5

2009

6.6

1985

7.2

2014

6.1

1956

7.7

2020

7.5

1989

5.2

2002

7.1

2017

7.4

1995

7.7

1998

6.6

2017

7.3

2018

8.2

1990

6.4

1958

6.6