1949

7.7

2008

7.7

2010

6.7

1998

6.0

1960

8.3

2011

6.9

1991

6.4

2006

7.0

1996

7.5

2014

8.5

1988

5.8

1895

6.8

1987

6.7

1999

5.9

1961

8.1

1965

7.2

2010

5.8

2006

6.6

2018

7.1