1991

6.0

2008

5.4

2012

5.1

2015

5.9

1990

6.9

1992

7.6

1966

7.3

2017

7.1

1940

7.3

1940

7.0

1996

7.2

1931

7.2

2018

7.0

2003

7.3

1999

7.5

1951

7.3

1983

7.7

2016

7.0

1987

7.1

2005

7.2