1988

5.5

2019

6.6

2012

6.0

2016

6.9

2001

8.0

2013

6.1

2020

5.8

1970

4.6

1980

6.7

2002

6.4

2010

5.5

1995

5.6

2010

6.7

2011

6.4

2021

7.0

1992

7.0

1977

6.2

1998

6.2

1971

7.7

1952

6.2