1964

6.2

1959

6.9

2000

6.4

1991

5.5

1997

6.1

2004

5.6

2006

6.7

1982

5.0

2019

0.0

2017

6.8

1973

7.5

1957

6.2

1960

6.1

2014

6.2

1971

6.0

1936

4.7

2002

6.0

2010

6.0

2007

7.4

1997

0.0