2005

6.8

1988

6.7

2009

6.0

1972

7.5

1991

7.3

2002

6.1

2000

7.4

1996

7.5

2018

7.5

2010

5.4

1983

6.6

1915

6.2

1983

5.6

1981

5.7

2003

6.5

1936

7.4

2012

4.9

1990

6.8

1977

6.7

1991

6.4