1999

7.6

2013

8.3

1940

7.1

1987

4.1

2011

6.2

2016

7.6

1991

6.4

2013

8.2

1961

7.2

1977

6.5

1999

5.1

2002

4.0

2014

7.4

2014

5.6

2007

6.0

2001

5.9

1993

6.3

2012

6.4

2003

6.2

2020

6.7