2015

7.4

2014

5.6

2007

6.3

5.0

1961

7.9

2017

6.1

2012

7.2

1973

7.5

2019

3.6

2011

6.5

1994

8.1

2003

6.3

1997

6.0

1982

5.8

2012

7.3

2021

9.2

2023

6.5

2021

7.7

2010

6.8