1922

7.2

2017

6.5

2016

5.9

2000

8.5

1987

7.1

1990

6.4

1956

6.2

1991

5.6

2018

6.0

1987

4.1

1977

5.2

2012

6.0

1890

4.9

1995

6.8

1965

8.0

1998

7.1

2015

5.7

1961

6.3

1976

5.5

2017

5.7