2001

6.2

2009

6.5

2002

6.0

2000

7.1

1999

6.1

2017

4.7

2013

6.0

1998

5.1

2001

7.0

1996

5.6

1976

5.3

2021

5.2

2017

0.0

2014

2.0

1937

5.7

2017

6.5

2017

7.1

2002

5.2

2006

6.8

2004

6.1