1989

7.8

1982

7.6

2009

6.2

2014

7.4

1994

5.9

1968

7.1

2000

6.1

2016

6.3

2010

6.5

2002

6.3

2001

5.3

2013

5.7

2018

5.3

1992

7.9

5.0

2014

6.8

2016

5.4

2006

6.8

2013

5.9