1991

5.3

2010

6.2

2017

6.9

1990

6.1

2018

6.0

2019

7.7

1992

7.2

2013

6.4

1977

6.7

2023

7.8

2014

5.4

2017

7.4

2011

6.2

1989

5.8

2003

5.7

2009

5.4

2002

8.4

1993

4.8

2003

6.6

2016

6.5