1981

5.1

2017

7.5

1959

8.2

1960

6.7

1972

6.4

2015

6.3

2016

7.2

2010

6.1

2001

6.9

2021

7.7

2006

5.9

2013

5.9

2007

7.4

1962

6.8

2010

7.1

1987

6.7

2017

7.1

1996

6.0

2012

7.3

2020

7.7