1982

6.4

2002

9.5

2010

5.8

1963

7.0

1996

7.7

2007

6.7

1994

6.8

2016

7.0

1992

6.5

1993

7.0

2017

5.9

1981

6.6

1989

7.8

2005

7.5

2011

6.7

2019

6.9

2008

6.1

2009

7.2

1989

6.2

2015

6.8