1952

6.2

2015

3.7

1998

5.6

2009

5.0

1980

6.2

2007

10.0

2011

7.4

2006

4.3

1989

7.1

1964

6.8

2019

6.2

1923

8.5

2014

5.4

1923

6.8

2014

5.5

1978

6.1

2015

6.9

1979

4.7

2002

5.2

2017

6.0