1983

6.3

1986

7.1

1990

7.5

1991

6.3

1986

6.6

1941

6.3

1996

6.5

2018

6.3

2021

6.8

2002

7.6

1973

6.9

2001

5.8

1988

6.2

2016

5.7

2005

6.5

2005

6.7

1997

6.1

1985

5.6

2020

6.3

2008

7.5