1996

7.1

2016

7.6

2009

7.3

2017

6.8

2000

7.4

2015

8.0

2010

7.7

1994

8.5

1975

8.4

2014

8.5

2019

8.5

2012

6.1

2006

7.4

2015

7.3

2020

8.1

1997

7.9

2024

7.5

1994

8.3

1977

8.2

2001

7.9