1999

7.3

1985

7.4

2016

5.9

2005

5.1

2017

6.3

2002

6.0

1988

6.6

1998

6.0

2006

6.2

2004

5.5

2012

6.8

1988

7.4

1993

3.5

2012

6.4

1987

4.5

2008

7.6

2017

6.7

2019

5.8

1968

6.2

2019

6.8