1939

7.9

1968

6.9

2016

5.9

1990

6.1

1961

7.9

1983

6.5

1961

7.7

1987

5.5

1984

7.3

1971

7.0

1935

7.4

1998

6.6

2001

6.4

1988

6.7

2002

6.3

2010

5.8

1992

6.7

1994

5.7

1999

7.5

2009

6.0