2004

7.1

2020

6.8

2012

5.6

1999

5.7

2016

6.1

1994

5.3

2019

6.2

1968

7.4

1993

6.9

2013

5.7

1981

7.1

1969

7.1

1992

7.3

2018

6.4

5.8

1977

7.4

2017

6.0

2021

8.4

1983

6.7

1984

7.2