1989

8.0

1990

8.5

2014

7.9

2001

7.8

1991

8.3

1974

6.5

2019

7.4

1975

7.8

2018

7.4

1982

7.9

1952

7.7

2015

7.5

2003

7.1

1987

7.7

2015

7.2

2010

7.0

2000

7.4

1980

8.2

1956

7.6

2006

7.9