1969

7.7

1994

5.7

1990

7.9

2006

6.4

1960

7.5

1958

6.6

1973

7.9

2019

6.2

2017

7.5

1963

7.1

1956

8.0

1988

6.1

2018

6.9

2009

6.0

2004

5.9

1977

8.0

2008

5.9

2020

6.6

2020

6.1

1938

7.1