2007

7.3

1990

7.1

2017

4.6

2008

7.5

2004

6.8

1976

6.6

2015

4.7

2004

6.6

2002

6.9

1984

7.3

2006

7.1

2007

6.1

2017

8.0

2008

6.6

1984

6.0

2015

6.5

2001

7.4

1997

4.8

2011

6.7

2017

7.3