1999

6.5

2011

7.5

2016

7.0

2008

7.2

2007

7.7

1998

7.1

2000

7.9

2015

7.7

2010

6.8

2015

4.2

2018

0.0

2005

7.7

1986

6.7

2018

4.7

1989

6.2

1995

8.2