1991

5.3

2007

10.0

1999

6.6

1966

7.7

2012

5.5

1994

6.4

2017

8.0

6.2

2013

5.1

2016

5.1

2020

6.9

2001

9.9

1930

7.3

1968

6.4

2015

6.9

2017

6.3

2014

5.4

2015

6.0

2009

6.0

2003

6.2