1980

6.3

1973

6.6

2006

6.8

1979

6.2

2018

5.8

2016

5.9

2022

6.5

2020

8.0

2017

6.2

2015

8.2

2010

5.6

1987

5.7

2015

6.8

2013

6.8

2007

7.6

1959

7.2

2003

6.2

1998

7.3

1998

7.3

1997

6.6