1984

7.2

1977

6.7

2020

7.0

2010

4.8

2009

5.9

2001

5.3

1985

5.5

1996

6.7

2007

4.9

1967

6.4

6.1

2012

7.7

2008

5.1

2004

6.0

1977

6.8

2015

6.7

1985

6.1

1991

5.3

1982

5.9

2008

5.3