2001

7.5

2019

8.1

2001

6.8

2008

5.9

2018

7.6

2011

6.7

2013

7.2

1989

6.3

2001

6.9

1965

8.0

2003

7.2

1957

8.5

1990

7.5

2017

7.4

2009

6.0

2014

6.2

1990

7.8

2014

7.8

2009

5.6

2016

7.5