1975

4.5

1999

5.1

2023

9.8

2020

6.5

2021

10.0

2013

6.7

2014

6.6

1990

6.1

1988

6.4

1977

9.8

2008

5.0

1994

4.4

2016

6.0

1974

5.0

2017

9.0

2015

7.6

1998

3.7