1973

7.5

2002

6.1

2007

6.5

1976

6.9

2007

5.0

2008

7.1

1950

7.0

2004

6.6

2019

6.4

1990

7.5

1967

5.9

1997

6.5

2011

6.4

2012

5.3

1955

6.3

1977

0.0

2015

6.8

1934

6.3

2014

5.8

2016

7.2