2009

6.4

2018

7.1

1994

3.9

1987

7.7

2015

6.5

2006

6.2

2006

7.1

1960

5.4

1999

6.1

1964

6.6

2008

4.5

2004

6.5

2007

7.6

2008

6.6

2006

7.0

2003

5.6

1993

7.2

2006

6.3

1998

5.8

1997

5.6