6.0

1999

6.6

2013

6.7

2020

7.5

2016

6.8

2012

5.3

2002

8.4

2009

6.1

1991

4.2

2012

9.4

2020

6.3

1999

8.0

2008

5.8

2014

9.0

1990

5.0

1979

8.0