1995

7.8

2001

7.6

1996

6.8

2000

8.0

2016

5.8

2017

6.5

2015

8.3

2014

7.1

1998

7.1

2018

6.9

1982

7.3

2012

7.2

1985

7.7

2016

7.3

2004

7.5

1991

7.4

1993

7.9

2006

7.4

2004

5.8

2016

6.5