1957

6.9

1993

5.6

2011

7.5

1990

4.4

2009

6.6

2012

6.5

2021

7.7

1972

7.4

2016

7.3

2017

8.6

2016

7.1

2021

7.2

1997

5.8

1967

6.6

2014

6.4

2013

7.6

2019

7.5

2014

4.9

2006

8.3

2021

7.2