1990

5.8

1972

6.2

1993

6.8

2007

5.5

2014

6.4

2004

7.3

1992

5.7

2001

5.2

2002

6.0

2018

6.7

2013

7.9

1996

6.6

2011

6.5

2011

5.9

1985

6.2

1971

7.2

2014

6.8

1956

6.7

1990

6.7

2016

5.7