2003

7.6

2017

7.2

1986

8.3

2005

8.2

2008

8.1

2017

6.7

1986

7.7

2007

7.9

2003

8.2

2012

8.4

2011

8.3

2004

7.8

1996

7.7

1991

7.6

1997

7.1

1990

6.8

2014

7.3

2010

7.2

2018

7.5

1998

7.9