2017

6.6

2016

6.1

2011

6.8

1966

6.2

2012

5.8

1999

6.8

2019

6.6

1982

6.7

1998

6.2

2014

6.7

1971

6.0

1993

6.5

1988

6.3

1969

7.7

1975

6.3

2002

7.5

2020

6.7

2019

5.4

6.6

1959

6.1