1991

7.7

2012

8.1

2020

8.4

1984

8.3

1998

7.8

2016

7.3

2016

6.9

2011

6.9

1990

7.6

2003

8.2

2009

8.0

2023

7.6

2013

8.2

1998

7.1

2014

5.4

2015

7.1

2014

7.9

1989

8.3

1999

8.7

2018

6.9