1940

8.3

1994

7.5

2000

6.3

2004

5.7

2002

7.8

1990

6.8

2008

5.7

1976

4.6

2015

7.0

2002

6.4

2024

4.0

2021

7.1

2001

5.9

2005

6.3

1975

6.0

2004

5.8

2022

6.6

2007

6.9

1986

6.7

1991

5.7