1970

6.3

1987

7.6

2016

5.9

1989

5.1

1999

5.8

1955

7.2

2008

6.0

2003

6.0

2019

6.7

1928

7.8

1966

7.3

2017

6.9

1951

7.6

2015

5.7

1989

6.7

2007

7.3

1947

7.4

2020

8.4

1990

6.4

1980

6.7