1963

6.8

1968

6.7

1977

6.6

2007

4.7

1947

7.7

2003

5.7

1968

6.4

1950

6.8

1990

6.0

2019

7.1

1991

6.7

1984

6.5

2005

5.2

2005

4.6

1952

6.7

1980

6.8

2008

7.2

2004

6.1

1969

5.1

2012

5.4