1968

5.8

1979

7.3

2007

6.3

2014

0.0

1993

5.3

2004

5.7

1989

5.8

1989

0.0

2016

7.7

2005

6.2

1999

5.5

2008

7.0

1928

6.1

1932

6.4

1929

6.8

1998

5.1

2002

3.9

1916

6.7

2017

6.0

2018

5.8