1999

5.1

2016

6.8

1988

6.1

2004

6.0

1959

8.2

2017

7.3

1991

5.3

2013

8.7

2013

8.4

2009

5.0

2011

7.4

2002

5.2

1976

7.5

1993

5.8

1925

7.1

2010

7.2

2021

7.8

2013

8.8

1987

6.5

2014

5.7