2014

4.4

2000

4.8

2006

6.0

2004

6.8

2015

5.7

2008

6.2

1978

7.5

1962

7.3

1984

6.2

1963

6.9

1992

6.1

1999

7.3

2014

7.4

2005

6.8

1993

7.1

2000

5.8

1989

6.7

2013

4.3

2014

6.1

2004

8.1