2004

6.4

2006

5.2

2000

7.0

2015

7.5

2000

5.8

2008

5.7

2005

5.5

1996

7.2

2005

7.2

2016

5.4

1969

2.0

1936

3.6

1998

1.9

1979

5.3

2001

7.8

1994

7.0

2018

4.1

1997

6.8

1998

7.1

2004

5.5