1990

6.5

1972

4.0

1968

6.4

2010

6.3

2002

6.1

2021

7.3

2001

8.9

2017

9.0

2000

6.6

1990

6.6

1997

6.1

2009

5.8

2008

6.8

1947

6.7

2013

4.8

2002

5.8

1992

6.4

1997

6.2

1997

6.5