0.0

1990

6.5

1971

7.4

2000

6.6

1926

0.0

2010

6.1

2015

7.5

2017

6.4

2014

6.9

1959

6.7

2000

5.8

1967

8.2

1947

6.0

1994

5.5

2002

6.4

1973

3.0

2025

7.0

1969

7.6

2017

7.4

2018

6.8