1976

6.6

2009

7.4

2016

7.0

2010

7.7

1995

7.2

1990

6.8

1975

8.2

2004

5.7

2019

7.1

2000

8.0

2021

7.3

2008

7.6

2006

8.1

1989

7.8

2015

7.8

2021

7.0

2013

6.8

2017

7.5

1993

7.9

2011

8.3