1953

7.2

2013

6.5

1999

6.8

1975

6.4

2015

8.1

2011

6.6

2001

6.8

2006

6.7

1993

6.5

2014

6.8

2018

6.3

1993

6.5

1965

6.4

1975

6.3

1999

5.9

1988

6.5

2016

7.3

2017

6.6

2014

6.3

2017

6.1