1960

8.4

1954

8.3

2018

5.2

1998

5.4

1992

6.6

2003

6.4

2008

4.9

1996

6.7

1996

5.5

1971

5.3

2005

6.1

2002

6.1

2017

5.9

2008

6.2

1962

3.4

1970

5.7

2002

2.8

1982

5.0

2002

5.7

2009

5.7