1965

7.7

2018

5.5

2014

6.9

2017

7.6

2016

8.2

2015

6.8

2019

7.1

2016

5.9

2009

7.4

1996

7.9

2012

7.7

2016

8.2

1980

8.2

2019

8.1

1970

7.3

1994

8.7

2005

8.1

1990

7.7

2009

7.6

2008

8.1