2000

7.2

2008

8.9

2004

7.9

2011

8.5

2013

8.1

2017

7.1

2016

8.6

2014

7.9

2015

7.4

1990

8.0

1959

8.4

2019

8.3

2001

7.8

1999

8.6

2017

8.2

1994

6.8

2014

8.3

2013

7.5

2011

7.6

2006

8.2