1961

6.6

1999

3.0

2002

7.5

2018

4.0

1986

7.6

2006

5.6

1995

8.4

2004

6.6

2005

6.7

1988

7.7

1977

6.0

2017

5.7

1940

5.0

2012

6.0

2016

7.3

1997

6.8

2004

5.7

2006

6.6

2001

7.2

2006

5.8