2017

5.8

2005

6.1

2004

6.2

1971

5.3

2008

6.2

1974

6.2

2000

5.6

1996

6.8

2008

4.9

1995

6.5

2020

6.6

1998

5.4

1952

6.6

1976

4.3

1998

5.4

2002

2.8

1981

7.0

1984

6.0

1967

6.7

1964

6.9