1999

8.7

2008

8.9

1966

8.0

2013

8.7

1975

8.2

2003

8.3

2024

8.3

2010

8.5

2017

7.6

2018

8.4

2011

8.1

2022

7.2

1981

6.9

2013

7.6

1990

7.9

2017

7.0

2021

7.8

2015

7.5

2006

7.8

1987

8.3