2012

6.6

1990

6.9

1997

6.4

1997

6.3

1989

7.8

2003

7.2

2011

7.1

2005

7.8

2007

8.2

1999

7.9

1997

7.0

1983

8.4

2019

6.9

2012

7.4

2016

7.5

2017

7.1

2020

7.6

2015

6.9

1972

7.5

1986

7.9