1997

7.9

1968

8.1

2001

8.4

1994

8.5

2014

8.5

2010

8.2

2017

7.3

2018

7.4

1995

7.2

2016

7.9

1989

8.3

2015

7.6

2019

7.8

2013

6.9

1994

8.5

2016

7.3

2008

7.7

1990

8.5

1994

8.7

2023

7.0