1931

5.8

1990

4.4

2021

9.5

1972

10.0

2018

5.4

1989

6.1

2013

7.7

2003

5.4

2016

5.8

1999

8.0

2010

6.0

2017

6.7

1973

7.2

5.6

2017

7.4

2015

7.2

2015

6.0

2005

6.5

2018

6.8