2009

6.2

2011

6.4

1990

4.4

1985

6.8

2020

6.7

2001

7.4

2013

6.6

1975

7.0

1988

5.5

2020

7.4

6.4

2012

6.4

1928

6.0

2018

6.3

1969

6.4

6.6

5.4

1979

7.0

2017

4.9