1999

7.0

2016

7.2

2004

8.6

2020

5.7

2003

8.2

2013

6.4

1968

7.3

2009

6.4

2009

6.8

2010

8.0

2007

6.7

2007

7.4

1951

7.9

1989

7.8

2014

7.2

1989

8.1

2002

7.2

2003

8.0

2015

8.0

1998

7.9