1987

6.5

1973

6.6

1994

6.2

1998

5.4

2008

5.8

1987

5.2

1995

5.7

1993

6.4

2001

3.0

2003

6.3

1984

5.9

2016

5.4

2018

6.3

2014

7.0

2015

7.1

2006

6.7

2010

6.1

2018

6.9

2002

7.3

2014

6.9