1984

7.5

2006

6.2

2006

5.1

1999

6.3

2003

5.5

1985

6.4

1998

8.1

2000

7.8

1999

5.7

1999

4.5

2017

6.3

2007

5.3

1998

5.7

1996

5.8

2004

6.6

1973

6.9

1985

6.5

1984

6.6

2017

5.0

2014

3.8