2002

8.3

2006

8.1

2008

8.9

1959

8.4

2008

8.4

2017

8.7

2005

7.8

2019

7.4

2004

7.9

2015

8.2

2020

7.5

1990

8.3

2004

8.0

1999

8.6

2016

7.3

2011

8.5

1964

7.9

2011

7.5

1990

6.9

1983

7.7