1997

7.5

1971

4.8

2007

6.1

1965

7.4

1976

6.5

1986

5.6

2013

5.2

2004

6.5

1995

7.6

2001

6.6

0.0

2014

5.3

1980

6.5

2009

6.6

2008

5.4

2009

5.7

1998

5.1

2018

6.3

2005

6.2

2018

6.3