1948

0.0

1997

6.3

1939

6.0

2013

7.7

1999

5.7

1989

7.1

2015

6.7

2010

6.4

2004

6.3

2001

6.1

2005

5.4

1996

5.2

2003

5.6

1984

6.9

1996

6.5

1991

6.2

2004

6.1

2004

5.6

1940

4.8

1996

6.3