1923

7.5

2005

6.2

2015

6.3

2012

6.1

1986

5.8

1937

7.1

2009

5.4

1995

6.7

2015

7.2

1994

7.1

1973

6.1

2011

5.6

2005

4.0

2016

5.2

2010

6.0

2012

5.9

2012

6.8

1970

7.7

2013

7.5

1990

5.2