2015

8.0

1997

7.0

1973

7.6

2007

7.9

2008

8.4

2002

6.7

1984

7.0

2019

7.0

2018

6.9

2009

7.0

1998

6.7

1967

6.5

1989

6.3

2006

6.1

2003

7.4

1986

6.8

1994

6.2

1976

7.3

2016

7.0

1985

6.5