1967

0.0

2005

5.9

1985

6.7

2007

5.6

1986

6.4

1982

5.2

1939

5.3

1997

5.8

1995

6.8

1990

6.5

2013

3.7

1996

6.1

1983

6.6

1993

6.5

2006

6.5

1990

6.9

2001

6.2

1968

2.0

1915

0.0

2016

6.4