2001

7.6

2005

7.0

2000

5.7

2009

4.5

2008

6.3

1965

6.6

2015

4.7

1996

7.3

2006

6.5

1969

4.6

2013

3.8

2007

6.6

2007

5.6

1962

7.7

1986

6.3

1985

7.7

2006

6.5

2017

5.9

1976

6.6

1925

6.9