1977

6.1

1996

7.0

1976

7.4

2016

5.0

2008

5.8

2004

5.3

1999

6.1

1991

7.3

2005

6.6

2006

4.0

2003

5.8

2006

6.5

1934

6.5

2019

6.8

2005

5.4

2004

5.4

2018

5.7

2014

6.7

2007

7.2

2004

7.0