2009

6.3

2007

7.5

2019

6.7

1999

5.9

1971

6.0

1988

6.5

2011

6.6

2008

6.1

1998

5.4

2008

6.7

2007

5.5

2003

6.8

1993

6.6

2018

6.1

1966

6.2

1991

6.2

2017

7.8

1959

7.6

1982

6.3

2017

6.9