2015

6.0

2012

6.2

2014

5.7

1995

4.6

2005

7.2

2019

4.3

1988

6.2

1992

6.9

1968

6.9

2016

6.0

2016

7.1

1996

6.1

1985

6.5

2009

5.4

1977

7.0

2003

6.8

2006

6.4

2021

5.7

2019

5.1