2005

6.9

2017

7.6

2015

6.3

2013

8.0

2008

7.6

2008

8.5

2016

7.3

2019

8.1

2007

6.4

1995

8.0

1985

8.3

2019

6.3

1995

7.2

1994

8.7

1938

7.1

1989

7.2

1989

8.3

2018

7.4

1988

7.8

2010

7.2