2000

6.0

2006

5.9

1999

6.9

1996

7.4

2003

5.4

1976

6.3

1993

7.0

1998

6.3

1964

6.1

1954

7.6

2005

6.2

2016

5.8

2004

5.6

2008

6.4

2015

7.5

2017

5.5

1952

6.8

2005

5.2

1977

5.6

2006

7.6