2000

4.2

2008

7.6

2014

6.1

1968

8.1

2017

7.3

1987

7.8

1960

7.5

1989

8.3

1976

8.1

1980

7.9

2022

7.2

1997

7.9

2019

8.0

2000

7.4

2002

7.3

1989

5.2

2005

7.4

2013

8.1

1994

8.5

2010

8.4