2013

6.4

2008

4.5

2017

5.8

1987

7.0

2017

6.6

1993

7.3

1987

5.3

1947

7.3

1939

7.1

2010

5.0

2006

6.8

1984

6.3

1974

6.2

1974

6.1

1959

6.6

1968

7.4

2011

6.5

1987

5.5

2023

6.8

1986

6.7