2013

7.6

2016

5.9

2017

7.7

2020

7.3

2011

6.8

2008

6.1

1994

6.5

1999

7.1

1973

7.4

2019

8.3

1964

6.8

2019

5.6

2006

5.1

1983

6.1

2008

6.5

2014

6.7

2009

7.2

2003

5.7

2016

6.8

2020

5.4