2003

6.3

2019

8.1

2008

8.5

2017

7.6

2014

8.0

2015

7.6

2016

7.9

1968

8.1

1997

7.9

1994

8.5

2012

7.4

2021

7.1

2013

8.0

2014

8.0

2016

7.6

1994

8.7

2007

7.5

1999

8.2

1978

7.4

2013

6.9