1975

6.9

1972

6.4

1966

6.1

1965

6.8

2017

5.0

1998

3.8

2004

8.1

2012

7.7

2003

5.1

1965

4.8

1993

6.1

2007

6.0

2016

6.5

1990

6.3

2023

6.0

2005

6.7

2008

6.4

2015

5.7

2016

4.9

2018

6.0