1999

7.4

1989

6.9

1970

7.1

1985

7.0

2003

6.3

2000

6.5

1982

3.2

2006

4.9

2018

6.9

2008

6.7

2008

7.5

2004

6.5

2002

7.8

2006

7.0

2013

6.1

1915

0.0

1933

5.0

1954

7.3

1964

7.2

1998

5.7