2016

5.9

2015

5.7

2017

6.5

1998

6.1

1972

6.9

1964

7.2

2006

7.4

1957

7.2

1971

7.1

1932

6.2

1955

5.6

2003

5.9

1994

7.7

1963

6.6

2019

7.2

6.1

1991

5.7

1999

8.0

2018

6.9

2008

7.5