1994

5.5

2012

4.3

1949

7.4

2004

7.3

2001

5.3

1973

7.3

1966

7.1

1998

5.0

2007

5.1

1996

5.9

2016

5.9

1992

8.0

1990

6.0

2017

6.9

2001

5.8

1988

7.0

2018

6.7

2020

5.6

1990

5.8

2008

6.5