1987

6.3

1988

5.1

2016

6.6

1928

7.2

1997

7.1

1992

7.0

1993

5.7

2017

6.1

1995

6.7

2005

5.5

1989

6.3

2015

5.7

2017

6.5

2008

6.0

1994

6.1

1987

6.8

1993

4.9

2009

7.1

1984

5.7

2004

6.4