1950

6.8

1939

7.9

2011

9.1

1977

6.8

2002

5.5

1996

5.7

2015

8.1

1989

6.2

2001

5.2

1967

7.3

2006

6.4

2017

6.8

1981

6.1

1977

6.6

1981

6.2

1976

7.6

1951

7.5

1966

7.0

2019

7.0

1951

7.3