2013

6.3

2010

8.2

1968

8.1

1995

7.2

2001

8.4

1989

8.3

2017

7.3

1990

8.5

1994

8.5

2008

7.6

2014

8.5

1997

7.9

2014

6.1

2015

7.6

2019

6.7

2002

7.5

2006

7.9

1990

7.7

2011

7.3

2016

6.8