2011

6.5

1985

8.3

1994

8.7

1989

7.9

1979

8.2

1997

7.9

2019

8.1

2015

7.9

1990

7.4

1972

8.7

2009

7.6

2006

7.5

2018

7.4

2008

8.5

2007

7.1

1987

7.3

2011

7.3

2015

7.3

2016

7.6

1995

8.0