1986

8.2

2018

7.6

2012

8.6

2013

8.3

2018

8.4

2015

7.3

1977

7.7

2007

7.9

2019

0.0

1973

6.8

2009

8.5

2004

8.4

2014

7.9

1991

7.6

2013

8.6

1990

8.0

2006

7.2

2016

7.3

2018

7.1

2019

8.6