1969

5.1

2010

6.7

2012

5.5

2000

6.2

2017

5.7

2006

7.8

1928

7.3

2005

6.2

1987

6.0

1964

7.0

1956

6.1

1993

4.6

1994

6.7

1993

6.2

2011

6.5

2016

6.3

1956

7.2

1990

6.1

2012

6.1

2015

6.3