1992

6.9

1969

7.3

2006

7.9

2014

6.8

2011

7.2

1989

7.7

2015

8.1

1999

8.3

2009

7.4

1994

6.8

2006

7.5

2008

7.7

2019

8.4

1982

7.5

2016

8.3

2017

8.3

2004

7.3

2000

7.9

1990

7.9

2008

8.1