1999

7.4

2016

7.6

1991

7.7

2006

7.7

2006

7.0

2006

7.9

1982

7.1

2009

7.9

2004

7.7

2016

6.2

2014

8.1

2007

7.4

2010

6.7

2020

7.3

1980

7.7

2003

7.7

2015

6.3

2019

6.9

1995

6.5

2007

7.2