1978

5.2

2010

6.1

1986

5.8

2012

5.7

2007

6.4

2012

9.7

2021

5.3

1996

5.4

1990

5.2

2015

6.4

2021

6.1

1989

5.8

1974

6.3

1989

6.1

1999

7.1

2019

7.6

2023

5.9

2017

6.2

2013

8.4

2022

5.5