1981

6.5

1950

8.1

2001

8.4

2000

7.4

2014

7.0

1997

7.0

2007

5.7

2021

6.4

2016

7.7

2003

7.8

1997

6.9

1956

7.1

1930

7.3

1943

8.2

2016

6.6

2017

4.9

1995

5.2

1989

6.0

2017

4.7

1993

5.7