2007

7.5

2011

7.6

1985

7.7

1990

7.5

1996

5.4

1989

8.1

2008

7.7

2008

7.7

2010

6.7

2020

6.9

2015

6.8

2013

8.0

2005

7.9

1984

7.3

1984

7.2

2005

7.7

1983

7.3

2017

7.7

2004

8.3

1998

7.2