1999

5.1

2005

5.9

2018

6.5

1991

5.9

2001

6.9

2024

7.1

2010

7.2

2019

6.4

2012

4.7

2021

5.3

2011

6.5

1976

7.5

1993

7.6

1996

5.7

2004

7.3

1980

6.7

2016

5.8

2009

7.7

2009

6.8