1928

7.2

1964

7.3

2005

6.8

2019

6.3

2002

5.9

1985

6.5

1997

7.1

1974

5.5

1989

6.3

2017

7.4

1992

7.0

1987

6.3

2009

7.1

2017

7.3

2004

6.4

1993

4.9

1987

6.8

2008

6.0

1984

5.7

2006

5.6