2002

7.6

2005

7.5

1998

8.3

2004

7.8

1987

7.3

2002

6.9

2001

7.8

1982

6.7

2014

6.4

2016

3.8

2017

6.7

1955

7.2

2003

7.8

2001

7.4

1971

6.4

1997

7.6

1980

5.7

1940

7.8

1984

7.5

2013

6.2