1990

7.6

1980

7.7

2021

4.7

2015

6.9

2004

8.0

1985

7.5

1984

7.8

1979

6.8

2018

7.1

2016

6.9

2016

7.5

1971

7.6

2017

6.5

2016

7.1

1995

7.2

2016

6.8

2010

7.8

2012

7.9

2006

7.9

2018

7.0