1990

4.7

1987

7.3

1998

7.4

1999

7.5

2016

5.9

2019

1.0

1998

6.4

2005

7.4

2005

5.1

1966

6.7

1947

6.8

1982

7.2

1996

6.8

2001

5.9

2006

7.0

2003

7.2

2017

7.6

1991

6.3

2010

6.0

1933

7.6