2017

7.4

1986

6.9

2015

5.7

2019

6.5

2006

6.0

1951

6.5

1974

5.5

2008

6.4

1998

4.4

2014

7.4

1986

2.0

2014

4.0

2009

7.3

1992

7.0

1969

6.7

2001

5.0

2005

6.0

1939

7.0

2017

7.3

1939

5.5