6.4

5.0

1975

4.5

2015

6.4

2015

6.6

2011

5.7

2007

6.5

2001

6.2

2007

7.6

2021

6.2

2012

6.3

2019

7.0

2016

6.7

2016

4.9

1967

6.5

2013

6.3

2013

6.7

2001

7.5

1994

7.2

2004

6.0