2004

9.5

2015

7.0

2005

6.1

2002

7.9

2020

7.8

2014

7.7

1959

7.6

2012

6.7

2010

8.1

2007

7.5

2018

8.2

2007

8.4

1998

9.0

1973

7.6

2017

7.9

2009

5.8

2006

8.1

2003

7.3

1990

7.6