1987

7.1

2017

3.9

2007

4.9

2017

4.8

2013

7.1

1996

1.8

1981

5.5

1999

8.2

0.0

2005

8.2

1990

7.4

1999

7.9

2003

7.6

1982

5.3

2002

7.3