1987

8.3

2000

6.9

2016

8.7

2002

7.5

2009

7.7

2001

7.2

2015

6.5

1993

8.1

2016

7.7

2021

7.2

2004

8.1

2021

7.7

1992

6.4

2017

7.7

2009

7.9

1998

6.8

1964

7.5

2022

5.0

2019

8.0

2014

7.7