1990

6.3

1997

6.5

1962

7.4

2016

5.2

2021

5.9

2018

7.7

1991

5.7

1974

6.4

1994

6.8

2001

7.2

2016

5.6

1967

6.9

2020

5.8

1999

6.4

2011

6.1

1973

6.8

1989

6.2

2015

6.8

2010

6.1

1991

5.0