1988

6.2

2006

6.6

1997

5.9

2020

5.3

2007

6.7

1996

6.4

1990

5.0

1998

7.0

2008

6.4

1948

8.0

2003

5.9

2019

5.4

1999

6.6

1950

7.5

1950

6.7

1987

5.8

1994

7.4

2023

6.8

1978

5.8

2017

6.8