2020

8.5

2007

7.1

1970

6.2

2007

7.4

2004

7.0

1995

6.7

2009

7.2

2019

9.5

1991

7.3

1999

7.5

1989

6.9

1997

6.0

1984

6.7

1998

5.3

2006

6.7

2003

6.5

2018

6.8

1991

6.3

1996

6.9

2016

7.0