2019

6.7

2016

8.0

1988

8.1

2010

6.9

2007

8.5

2012

8.4

2017

7.9

1959

8.4

2003

7.9

1999

7.9

2018

7.6

2016

7.6

2004

8.6

2008

7.4

2006

7.8

1998

7.2

2002

7.5

1990

7.1

2014

7.3

2009

6.8