1999

7.3

2002

8.4

1979

6.1

2017

6.9

2016

6.2

1994

6.2

2013

7.6

1986

6.4

1988

6.5

2010

6.7

2007

7.4

1981

6.5

2011

7.0

2020

6.5

2015

7.3

2015

7.2

1996

5.9

2014

6.8

1997

5.4

1999

6.6