1993

5.5

2019

5.4

1997

6.5

1977

6.3

2015

6.4

2016

6.9

2016

7.0

2014

7.6

2008

7.1

2020

7.0

2019

6.0

2013

6.1

2023

9.4

1980

5.6

2007

7.4

2009

7.1

1972

6.4

6.1