2016

6.9

1988

5.2

2003

5.7

2011

7.5

2019

6.6

2018

7.1

2009

7.7

1999

7.2

1997

7.4

1939

7.9

2014

7.5

2014

7.5

1989

8.3

2017

7.3

1985

7.7

1956

6.2

2015

7.5

2018

6.9

2010

7.8

2002

7.7