1968

6.9

1990

6.1

2003

6.1

1989

5.4

2019

8.1

2018

6.4

1951

7.2

2008

8.5

1950

7.0

1988

7.1

1972

6.2

1948

7.9

1962

7.7

2001

4.3

1974

6.5

1954

7.2

1961

7.2

1985

6.2

2014

7.0

1950

6.6