1999

4.2

2018

5.6

2013

4.0

2009

7.1

1973

5.3

1979

4.8

2021

6.5

1994

5.8

1947

6.2

1998

3.7

1996

4.1

1984

5.6

2004

5.6

1980

4.3

2002

5.0

1952

6.3

2018

7.1

1958

7.4

2002

6.3

1994

7.5