2014

4.9

2019

6.3

2021

7.2

2019

6.2

1970

7.7

1994

6.5

2020

6.8

2015

6.1

1978

7.5

2005

7.1

1992

6.6

1986

6.8

1998

7.1

2011

7.8

1960

7.7

2017

6.6

2000

7.9

2019

7.4

2012

6.2

2018

8.2