2000

8.0

1980

8.6

2020

8.4

2006

8.0

2018

7.9

1985

7.7

2016

7.1

2015

7.6

2012

8.1

2008

7.5

1990

7.5

1990

7.9

2014

8.1

2009

7.4

1995

6.4

2017

7.1

1979

6.8

2019

7.4

1989

7.7

2024

8.5