1980

7.1

2015

7.5

1978

6.2

1987

7.0

2020

6.7

2017

5.7

1952

5.9

2001

6.3

2004

4.9

1957

0.0

2007

6.8

2007

7.2

2004

7.6

2002

0.0

1964

7.4

2009

5.8

1955

5.6

2005

7.3

2013

10.0

2008

3.4