1972

7.5

2016

6.5

1980

6.7

2006

6.1

2012

6.4

2014

7.1

1993

6.1

1999

5.6

2001

8.4

2011

7.4

1959

8.0

1994

7.4

1999

7.2

1999

6.3

1985

6.2

1928

8.0

2007

5.8

1989

6.9

1999

8.4

1992

6.9