1999

7.5

2009

7.5

2012

6.4

2009

7.9

2018

9.6

2019

7.2

1997

8.1

2013

6.9

1990

7.1

2003

7.6

2012

7.1

2014

7.7

2010

7.9

1967

7.7

2016

7.1

2015

6.1

1999

7.9

1985

7.6

1996

5.3

2015

7.1