1990

6.7

2023

9.1

1968

6.9

2020

5.9

2003

6.8

1983

4.5

2014

5.7

2017

6.5

1993

6.1

2005

5.2

2000

5.2

1969

6.6

2015

7.3

2004

6.4

1958

7.0

1974

8.6

2020

6.5

2001

6.8

2004

7.4

2006

6.8