1982

7.2

1971

8.2

1975

8.4

2000

7.1

1994

8.7

2019

8.5

2012

6.7

1996

7.9

2013

7.5

1983

7.9

2008

8.5

2007

6.1

2010

7.7

2016

5.9

2015

6.7

2009

7.3

2012

7.4

2017

7.6

2007

7.8

1999

8.4