1991

7.3

1989

7.2

2001

7.9

2003

7.3

2004

6.3

2016

10.0

1960

7.8

2014

6.1

2009

6.9

1966

7.7

2021

5.6

1999

6.4

2003

5.8

2005

6.7

1976

5.0

1993

7.2

1970

6.7

1998

7.1

2017

6.6

1934

7.0