1998

9.2

2009

7.7

2002

8.2

2017

7.9

1983

6.9

1994

6.9

1994

7.3

1991

7.2

1973

7.2

1989

8.3

1999

7.4

2012

8.7

2001

6.0

1991

7.6

2016

7.2

2021

8.0

1954

6.1

1999

7.3

1965

7.8

2023

9.2