2005

8.1

2008

8.9

2001

8.0

2002

7.5

2014

7.6

2012

7.6

2011

8.5

2008

7.5

1992

6.9

2008

8.1

2019

8.5

2015

8.7

2005

7.6

2020

8.4

1989

8.2

2013

8.6

1960

7.4

2001

7.8

2009

6.8

2013

8.1