2004

7.1

1990

6.7

2014

6.8

2020

6.1

2021

7.5

7.8

2012

6.2

2017

6.8

2017

7.4

2008

6.7

2013

6.6

1984

6.3

1997

6.6

1978

6.8

1963

7.0

1998

6.7

2012

7.8

1995

8.0

2013

7.4

1985

6.2