1972

7.9

2015

6.7

1993

7.1

2016

6.0

2015

7.1

2014

6.5

1974

7.5

2014

7.2

2015

7.2

1996

7.4

2011

7.5

2015

6.1

2014

7.0

2004

6.8

2017

6.4

2015

6.7

2004

4.7

1992

6.3

2005

6.9

1993

5.0