1988

5.5

2009

8.5

2014

6.1

7.8

2021

7.7

1961

6.9

1996

7.5

1952

6.4

2008

6.4

2020

7.2

2015

7.4

2006

5.7

1953

7.2

1975

7.9

2017

4.9

2002

6.9

2012

6.6

1984

7.2

2024

6.1

1956

7.6