1964

7.0

1966

6.3

1972

7.2

1988

6.5

2016

6.7

2009

7.4

1963

6.9

1999

5.1

2011

7.0

2014

7.0

2011

7.1

1986

6.8

2010

7.0

2003

6.1

1997

6.2

2008

7.5

2016

6.4

2008

6.2

1995

6.8

2009

4.7