2005

6.5

2013

5.8

2014

7.9

1993

7.4

1955

6.0

2010

6.2

1977

6.7

1956

7.7

2017

6.9

1989

7.1

1955

6.3

1990

6.6

1990

6.1

1956

7.5

1984

7.3

1975

6.9

1977

6.7

2007

7.3

2016

6.7

1989

7.4