1995

7.5

2000

6.3

2016

6.3

2000

6.4

2017

7.1

1990

6.5

2008

5.6

2020

5.8

2010

7.0

2005

6.1

1995

7.9

1988

7.5

2017

7.3

2017

6.5

2018

5.8

2002

6.1

1984

7.2

2014

6.4

1995

6.8

2006

7.0