1984

7.2

2020

6.0

2014

8.5

2008

6.8

1968

6.4

1999

7.4

2004

5.7

2014

5.6

2014

5.9

1988

5.1

2015

7.7

2017

7.2

2018

7.1

1976

4.8

1965

6.7

1998

6.5

2014

8.5

2002

7.5

2015

7.4