1966

6.2

2011

6.6

1988

6.5

1975

6.8

1969

5.1

1984

7.2

2014

6.7

1999

5.9

2004

7.1

2016

6.1

1993

6.5

1989

6.2

2019

6.7

1920

7.3

1988

6.2

2006

7.4

2002

5.5

2019

6.7

2019

5.1

2021

6.8