1958

6.7

1957

6.4

1959

7.5

1965

6.1

1999

7.5

2019

6.9

2009

5.3

2018

7.9

2013

7.5

1994

9.2

1989

8.0

2011

7.6

2004

8.1

2008

8.4

2014

6.9

1963

5.7

1987

4.3

1992

6.5

1960

7.6

1987

7.7