1968

6.4

2018

6.5

1985

8.3

1994

8.7

2016

7.6

2009

7.6

2013

8.1

2019

7.4

2016

7.6

1972

8.7

2013

6.5

2019

7.8

1997

7.9

2015

7.1

1999

8.4

2015

7.4

2018

7.4

2012

7.4

2020

7.3

2023

8.1