1987

6.0

1999

6.8

1967

7.7

1993

7.7

2018

6.4

2016

7.9

2017

5.5

1955

7.3

1939

7.2

2007

5.4

1988

5.0

1987

7.3

2005

7.7

1995

7.0

1992

6.7

2002

6.6

1998

7.7

2006

6.1

2007

5.9

1998

7.3