2015

6.4

1978

6.9

1994

6.2

2000

6.0

2012

7.2

2014

5.8

2012

7.3

1994

7.3

1973

7.5

2015

6.1

2011

5.9

1988

5.2

2004

5.9

1988

6.5

5.4

2016

5.6

2021

6.1

2017

7.3

1973

6.5

1998

7.5