1967

7.1

2015

7.9

2007

7.0

2005

5.9

1985

7.2

2011

4.9

1992

8.0

2001

6.7

2020

7.4

1998

5.0

5.0

1964

6.0

2015

4.5

2016

6.4

2003

7.0

2022

8.0

2023

6.3