1966

8.5

1998

5.4

2006

5.1

1975

6.0

2014

4.2

2003

8.7

2005

5.2

1971

7.0

1997

7.8

1959

7.0

2013

7.6

2003

7.2

2021

7.2

1993

6.9

2017

7.3

2007

8.1

2021

10.0

2020

9.0