1965

7.4

2010

6.9

2008

7.5

2002

9.5

1994

7.5

2006

6.4

2021

7.7

1985

7.0

2015

7.7

2010

7.1

2014

6.8

2010

5.5

1965

7.4

7.8

1925

7.3

1967

6.9

2017

8.2

1986

7.8

1955

7.9

1978

8.0