2004

6.1

1937

7.1

1990

7.0

2005

4.6

1991

6.3

1963

6.8

1966

7.7

1952

6.7

2000

7.3

1950

6.8

1976

6.7

1923

7.5

1968

6.7

1969

5.1

2009

4.7

1969

7.6

1986

5.8

2016

5.7

1963

8.1

2017

8.0