2017

7.3

2014

5.6

2015

7.4

7.8

2009

8.5

2021

9.2

2012

6.3

2008

6.7

2021

6.2

1992

6.1

1970

7.6

1994

5.6

2019

8.7

1998

6.6

1993

6.5

2012

6.8

2023

6.5

2009

7.0