1972

7.6

1967

6.5

2013

6.6

2014

6.0

2015

5.9

1988

6.6

2001

6.1

1968

6.9

1990

6.8

1987

5.5

2013

6.7

2011

5.7

2015

6.4

1991

6.3

2015

6.3

1994

5.7

1955

7.2

6.4

2007

6.6

1990

5.5