1976

7.9

2018

8.4

2003

8.3

2004

7.8

1965

7.2

2009

7.5

2020

7.5

1996

7.0

1991

7.6

2001

8.1

2015

8.3

1996

8.0

2007

8.1

2014

7.2

1993

7.4

2019

7.9

2010

8.1

2018

7.9

2014

6.8

1988

7.5