2009

7.4

1986

8.4

2004

8.6

2003

8.2

2020

7.6

2015

7.7

1994

8.1

1999

7.6

2016

8.5

1996

6.8

2017

8.2

2012

6.3

2005

8.6

1981

7.9

2013

7.5

1998

7.2

2002

8.6

1990

8.0

2012

7.0

2017

7.4