1965

7.4

2020

5.2

1986

5.6

2015

6.5

2015

4.6

1974

6.3

1980

7.1

1985

5.3

2011

5.1

1940

7.0

1961

8.0

2008

7.0

2004

6.8

1950

7.1

2012

8.4

1966

7.1

2019

6.4

2009

7.0

2012

6.7

2012

6.5