1999

7.4

2013

6.1

2004

7.1

2006

7.0

2002

5.5

1994

7.4

2015

6.9

1964

7.3

1995

6.7

2006

7.1

2009

6.9

2014

6.1

1954

8.0

1960

8.1

1976

7.8

2018

7.3

1988

7.3

2013

6.0

2012

6.0

2017

5.9