1985

6.5

1989

6.3

1991

6.2

2006

7.7

1973

7.6

1892

4.7

1892

3.7

1987

6.9

1982

7.2

2003

7.2

1980

7.8

2004

6.1

2020

6.2

1998

7.3

2003

6.9

1994

7.0

2005

6.4

1986

6.8

2017

7.4

2016

7.0