2013

5.2

2014

6.8

1970

6.4

2012

6.2

2016

6.5

1959

7.7

1999

7.3

1964

7.4

1975

6.8

2007

6.9

2010

7.0

1984

7.2

2007

5.5

2000

7.4

2015

5.7

1989

8.1

2019

5.8

1945

7.2

2002

7.1

1930

6.3