1975

7.1

2014

5.6

2023

6.4

2018

6.5

2024

6.0

2015

6.7

2023

6.9

2015

6.4

2013

4.8

1985

6.1

5.6

1972

6.6

1985

6.9

2017

5.9

2021

9.2

2010

7.1

2012

7.7

1980

7.1

2014

7.8