1988

7.6

2011

8.5

1985

7.9

1972

7.7

1952

6.8

1999

7.4

2014

7.2

2007

6.9

2017

6.3

2016

7.6

2018

8.5

2020

7.5

2021

10.0

2020

8.1

2017

7.0

2000

6.5

2014

8.3

2004

9.1

2008

3.6