1994

4.7

1980

6.4

2014

5.5

2012

6.1

2017

5.6

2008

5.6

2014

6.7

2012

5.8

2009

7.3

2015

8.1

2021

6.8

1972

7.1

2017

6.8

1972

6.7

2013

4.6

1994

4.6

1999

6.5

2018

6.5

2016

5.2

2006

7.0