1955

7.2

1947

6.4

1997

6.9

2002

7.3

2003

7.6

1993

6.3

2005

6.8

2004

7.6

2005

7.5

1995

6.7

1973

7.1

2006

6.4

1993

6.1

2014

2.0

1952

6.3

2016

4.8

2002

7.1

2005

6.4

2014

4.2

2003

5.2