1974

4.7

2005

7.2

2004

2.9

1961

7.6

2010

6.3

2017

6.6

1996

7.0

2002

6.1

2003

6.3

1982

6.5

2004

5.3

1992

5.0

2016

5.1

1948

6.6

2014

7.5

1997

4.9

2009

0.0

1952

7.4

1934

6.3

1939

7.8