1993

7.7

2000

6.8

1922

4.7

2000

6.7

2015

7.3

1998

8.1

2014

8.5

2014

7.4

2017

7.6

2017

6.7

2015

7.5

1972

8.7

2016

7.9

2018

7.5

1987

7.3

2009

7.6

1980

8.2

1990

7.2

2015

6.7

2011

6.1