1991

6.1

2011

6.5

2012

8.2

2000

6.3

1997

3.5

2013

5.2

1990

7.7

2002

6.7

1971

7.5

2003

7.1

2020

2.0

1937

5.0

1960

8.2

2008

5.7

2007

4.0

1938

7.0

2008

6.4

2012

10.0

1996

5.9

2007

6.3