1960

7.6

1970

7.5

2020

7.1

2016

6.4

2005

7.0

2005

7.3

1996

9.0

2005

8.2

2014

7.0

1987

10.0

2017

7.2

1973

6.9

2009

7.4

2018

7.1

2015

6.8

2022

6.0

1995

6.4

2004

7.6

2018

7.3

1994

7.6