1930

7.3

1994

7.1

2013

6.8

1980

7.1

2001

7.3

2006

6.6

2017

6.9

1974

7.6

2007

5.1

2002

6.7

1993

5.7

2017

6.7

2017

7.3

1976

6.4

2018

5.5

2017

5.5

2017

7.5

2017

6.2

2017

6.5

1999

10.0