2014

6.2

1994

8.5

2000

8.2

2007

7.8

2019

8.1

2017

7.6

2011

6.9

2018

6.8

2018

6.9

2009

8.2

2015

7.6

2019

7.8

2004

7.4

2015

7.4

1999

8.2

2017

7.3

2012

7.8

1985

8.3

1980

8.2

1981

7.3