2017

4.7

1968

7.2

1992

6.7

1998

6.6

1978

7.6

1975

7.8

2002

7.2

1971

7.4

2006

6.0

2006

5.3

2008

6.6

1982

7.5

2013

4.5

1995

8.4

2009

5.0

2018

4.6

2017

3.6

2016

5.6

1997

7.4

1996

7.9