2000

6.3

2013

5.5

2006

7.4

2014

8.5

2018

7.5

2002

7.3

2014

7.9

1958

8.2

1980

8.2

1990

7.2

2015

7.3

1972

8.7

2003

7.8

1971

8.2

2016

7.9

2018

8.2

1998

8.1

2009

7.7

1938

7.5

1999

8.4