1990

6.9

1997

8.5

2002

7.3

2009

7.9

2005

8.0

2015

7.4

2018

8.6

2016

8.0

1997

8.0

2021

8.2

2018

7.6

2009

7.4

2017

8.2

2014

6.7

1993

7.2

1987

7.7

2020

6.2

2002

7.5

2001

7.4

2019

6.3