2014

6.9

2010

8.2

2017

7.2

2002

8.0

2015

7.5

1978

7.2

1973

7.7

1994

8.5

2001

7.3

1995

8.4

2003

8.3

1985

7.7

2009

5.9

1920

7.9

1968

8.1

2017

7.4

2017

7.5

1981

6.2

1971

6.8

1982

7.8