1955

7.3

1994

6.8

1976

4.5

1969

6.7

1967

7.3

2017

8.3

1987

6.9

2000

4.8

1974

7.3

2017

6.8

2006

6.7

1925

6.0

2016

5.1

1990

5.9

1998

5.6

1941

7.4

1928

5.6

2009

4.2

1960

6.6

2002

6.4