1960

6.3

2014

5.9

2020

6.1

1998

6.6

2001

7.9

1959

8.1

1989

6.9

2019

8.0

1979

5.7

1996

5.8

1985

6.5

2008

6.9

2017

7.0

2014

6.7

1972

7.4

2005

6.8

2017

5.7

2004

6.7

1938

5.0

1935

4.5