2017

6.7

1991

7.2

2000

7.4

2013

6.9

2006

7.5

1989

6.0

2019

6.0

1984

0.0

1988

0.0

2018

6.9

2012

5.5

2015

5.3

2016

6.2

1976

6.0

1991

6.0

1998

4.7

1992

2.0

2017

4.9

1960

8.0

1989

6.0