2007

7.6

2002

8.2

2005

7.7

2016

7.4

2021

6.7

2004

8.3

2018

7.8

2010

7.6

2017

8.0

2012

7.0

2015

7.5

1994

8.5

1973

8.0

2020

7.5

1990

7.6

1989

6.6

1974

8.1

1980

8.2

1998

7.5

2020

8.0