2004

7.9

1989

7.3

2006

7.0

2015

7.2

1981

7.2

1960

7.8

2019

6.8

1977

7.4

1958

7.6

1997

6.5

1990

7.0

2015

6.8

2001

7.5

1970

7.1

2010

6.7

2009

5.6

1996

7.6

1980

7.5

1996

6.7

2011

5.6