1990

6.1

2014

7.0

1996

5.3

2017

6.1

2015

6.3

2018

7.7

2019

6.5

1982

7.6

1985

6.7

1988

6.2

1998

6.2

1953

7.2

2002

6.5

1973

7.9

2016

6.1

2016

6.7

1933

7.5

1963

7.1

2008

7.2

2018

6.0