1972

7.5

2014

8.5

2016

7.3

2016

7.9

1994

8.5

1994

8.7

2018

7.4

2019

7.8

2023

7.0

2001

8.4

2019

8.5

1975

7.7

1968

8.1

1994

8.5

2015

7.3

2001

7.9

2008

7.7

1997

8.2

2017

7.6

2023

8.1