1994

6.6

1957

7.2

1966

6.3

2010

5.6

1999

5.1

2014

7.0

1980

6.4

2015

8.0

1996

5.8

2005

9.9

1963

6.9

1988

6.5

2017

5.5

1993

6.6

2003

6.8

2005

5.2

2016

6.7

1995

7.8

1964

7.0

1967

6.5