1999

6.8

2019

7.4

2007

6.1

1933

0.0

2015

8.0

2009

4.9

2017

6.0

2004

7.2

2013

6.0

2014

5.8

1991

8.3

1965

6.3

2006

7.4

1990

6.9

1990

6.6

1991

1.0

1985

6.0

1988

6.6

2005

5.5

1997

6.6