2018

3.9

2018

3.7

2016

5.1

2014

4.7

1989

4.3

1988

5.7

2012

1.3

2004

10.0

1989

4.3

1981

6.4

1985

7.0

1989

4.5

1983

8.2

1988

5.2

0.0

1990

6.1