1942

6.9

2015

6.6

2008

8.7

2003

6.7

2003

7.1

2014

7.1

1998

5.8

2005

6.4

1997

6.1

2010

6.1

1957

7.2

1969

7.6

2013

7.4

1994

6.2

6.1

2013

7.5

1970

6.4

1965

6.9

1966

6.3

2016

7.1