1997

7.3

2021

8.3

1990

7.6

1962

7.3

2010

7.7

2009

7.6

2000

8.2

1985

7.7

1994

7.0

2003

7.6

2017

7.4

1977

7.2

2021

7.2

2016

7.5

2016

7.6

1972

7.7

2011

8.1

2019

8.2

2015

7.8

2012

8.0