2021

8.6

2016

8.4

2020

8.7

2002

7.1

2015

7.7

1992

8.2

1989

8.0

1985

7.8

2007

7.9

1977

7.4

2005

8.2

2003

7.8

2017

8.4

2016

8.6

2008

8.5

2011

8.0

2017

7.5

1999

8.3

2018

8.2

2008

8.3