1981

3.2

1975

6.0

1942

4.5

2016

4.6

1983

5.6

1977

4.8

2010

3.8

2005

5.3

2007

6.1

2008

5.9

1976

6.4

1989

4.8

2009

5.4

1942

6.5

1992

6.3

1942

5.8

1969

3.9

2002

7.0

2014

4.7

2018

2.8