1996

8.0

2000

6.7

2006

5.6

1987

6.4

1952

7.9

2017

7.0

2016

8.0

1991

6.5

2007

6.1

2006

7.8

2015

5.1

2003

7.0

1995

6.3

2021

4.5

2005

7.5

1994

5.9

1987

7.7

1953

8.2

1995

7.6

1965

6.3