1971

6.9

1959

5.2

1999

6.4

1999

6.2

1987

6.3

2000

8.2

1934

6.3

2000

6.2

2003

5.6

2004

6.0

2009

5.8

1997

7.6

2009

7.2

2006

6.5

1952

6.3

1997

7.5

1991

7.7

2021

6.4

2022

6.4

1996

6.6