2000

5.2

1996

7.9

2008

5.8

1937

7.1

1994

7.1

2005

6.2

1990

7.0

1961

7.8

2012

7.3

2018

5.4

2011

5.9

1942

6.9

1968

6.7

2018

5.5

2012

6.9

1976

7.5

1969

7.1

1981

6.3

1996

5.3