2015

6.1

2011

6.7

2006

5.1

1959

7.3

2015

5.5

1973

7.3

1975

7.7

2010

5.2

1962

7.6

1969

7.1

2007

7.0

1997

7.5

1999

7.2

2012

6.0

2003

6.8

2016

7.5

2019

7.1

1967

6.8

1928

6.9