2005

8.2

2009

8.3

1990

6.9

2002

7.9

2017

7.7

1989

8.1

2013

7.7

1997

8.4

2001

8.2

2015

8.6

2018

7.6

2009

6.8

1980

7.1

1996

6.4

2002

8.3

2011

6.4

2019

7.1

2007

7.5

2001

8.1

2013

7.5