2005

6.9

2013

5.6

2017

5.6

2015

8.1

1977

6.2

2001

7.4

1988

5.5

2007

7.2

2011

6.5

2017

6.8

2015

6.9

1989

6.5

2005

3.7

1986

5.8

2004

7.0

2008

6.2

2015

7.2

2016

7.0

1997

5.4

1992

7.1