2000

7.2

2020

6.8

2016

5.9

1984

7.2

1993

6.9

1956

7.9

2009

6.7

1988

6.9

1987

7.6

1994

6.1

2020

7.0

2012

6.9

2018

6.7

2016

6.5

1968

7.4

1969

7.1

2011

5.5

2014

4.9

1975

5.4

1995

7.4