1995

6.4

2011

7.4

2010

7.6

2017

5.8

2014

6.3

1985

7.5

1993

7.9

2017

8.1

1997

6.3

2006

7.4

1995

8.1

1989

8.5

2012

6.8

2011

7.4

1984

7.4

2007

7.7

1994

6.8

2016

8.2

2011

7.9

1999

8.3