2019

6.5

2021

7.7

2015

7.4

1967

6.9

2007

6.0

2006

5.1

1993

5.5

1979

6.8

1985

6.5

1988

6.4

2010

6.1

2011

6.2

1967

6.7

1982

7.6

2011

6.4

1996

8.0

7.8

2006

6.9

2017

7.4

2006

6.8