2017

6.1

1994

6.2

2004

7.3

2011

6.6

1985

6.7

1993

6.4

2014

6.3

2016

6.7

2002

6.5

2001

6.7

2005

7.2

2018

5.9

2003

6.3

2010

7.7

1975

6.8

1991

6.2

1993

6.6

2015

5.5

1988

6.4

2008

6.2