2004

8.6

1984

8.4

2011

8.1

2016

6.9

2005

8.5

2018

8.5

1992

7.2

2006

7.1

1977

7.2

1965

7.9

1998

7.4

2018

8.1

1977

8.1

2001

7.2

2019

7.5

2012

7.5

2013

7.8

2014

5.7

2017

8.1

2008

7.6