1978

7.2

2001

8.6

1972

7.7

1989

8.1

2000

8.0

2009

7.6

2020

8.4

2023

8.0

2022

8.3

1993

7.0

1996

8.0

1990

7.9

2011

8.0

2011

6.1

2008

7.8

2000

7.9

1998

8.0

2016

6.5

2017

7.2

2002

8.3