1992

5.0

1965

6.8

2011

6.7

1998

6.2

2008

5.7

2001

6.4

1997

6.9

2017

6.8

1964

7.0

1965

8.0

1940

7.8

1955

7.2

2019

6.7

2021

7.1

2013

7.3

2016

6.0

2015

5.1

2007

7.3

2002

7.1

2016

6.5