1987

6.3

1970

5.5

1975

5.8

2018

5.6

2007

6.1

1995

7.6

2005

6.3

2002

7.1

2006

7.8

1996

8.0

2014

6.9

1990

9.0

1928

0.0

2019

7.1

1936

7.2

2016

0.0

1964

0.0

1987

8.6

2015

5.2

2001

4.4