1976

8.2

1999

5.6

1998

4.4

1992

6.8

1985

6.6

2018

6.7

1997

5.7

2005

5.8

1927

8.1

1985

8.3

1932

7.3

2005

6.6

2015

7.6

1955

6.5

1996

5.8

2006

5.5

1992

5.4

1996

7.5

2017

7.8

2022

7.0