1959

5.0

2015

7.2

2005

6.1

2009

7.2

2003

5.1

1974

6.7

2004

6.1

1991

6.3

2010

5.8

2008

6.6

2000

7.4

1995

6.9

2005

6.7

2013

7.1

1997

7.6

1994

7.1

2009

5.4

1997

7.9

1991

6.8

1952

7.7