2015

6.1

2009

7.2

2004

7.3

2023

8.5

2000

7.7

2007

7.4

2012

7.3

2015

7.6

1993

7.9

1990

7.1

1972

7.1

2016

7.3

1974

7.0

2007

7.1

1988

8.1

2014

6.2

2004

6.2

1980

6.1

2008

7.7

2011

6.4