2010

8.1

2011

6.3

2008

8.4

2015

6.9

1991

7.7

2010

7.6

1999

8.0

1963

5.7

2013

7.1

2005

8.6

1990

8.1

2003

7.8

1967

7.4

1973

7.0

1986

8.4

2004

5.0

2018

7.0

2012

7.4

2019

8.2

1990

7.2