1998

6.9

1985

8.3

1994

8.7

1972

8.7

1997

7.9

1989

7.8

2007

7.1

1995

8.0

1990

7.4

2006

7.5

2015

7.9

2019

8.1

2004

8.1

2008

8.5

2011

7.3

2009

7.6

2007

7.8

1979

8.2

2007

7.3

1940

7.1