1990

7.5

1995

5.4

1968

6.9

1936

7.1

1992

5.3

2014

6.6

2007

7.0

1958

7.7

1987

7.1

2008

6.5

2004

7.8

1991

8.1

1980

8.4

1986

5.6

2009

7.4

1989

7.0

2008

5.6

1983

7.9

1985

6.2

1989

6.6