1931

5.8

1957

7.2

1998

6.1

1993

5.8

2005

6.4

1999

5.1

2010

7.1

1978

6.0

1966

6.3

2001

6.7

2012

6.7

1990

6.1

6.8

1984

7.1

1982

6.2

1983

5.5

2021

5.6

2006

7.0

2016

5.9

2013

7.0