1962

7.2

2000

8.0

1990

7.8

2016

7.5

1988

6.8

1990

6.9

1997

7.3

1977

8.2

1992

7.0

2017

8.2

2004

8.6

1999

7.7

2021

7.2

2009

6.9

2008

6.0

2016

7.3

2013

7.2

2015

8.3

2007

6.7

1961

7.5