2014

6.5

2021

8.3

2016

6.9

2009

7.1

1989

5.9

2005

7.8

1999

7.1

1975

8.4

2001

8.9

2018

6.4

2005

5.4

2017

7.1

1941

6.2

1993

6.4

5.4

2002

7.1

1979

6.7

2006

4.9

1973

6.4