2000

7.4

2006

7.5

2017

6.7

1984

0.0

1991

7.2

2019

6.0

1988

0.0

2015

5.3

2018

6.9

1989

6.0

2012

5.4

2013

6.9

2016

6.2

1991

6.0

1976

6.6

1992

2.0

1998

5.4

2003

7.4

2008

8.5