1971

6.1

2013

6.2

1979

7.1

2006

6.3

2017

6.6

1974

6.6

1991

5.2

1988

6.5

1984

6.9

2019

6.7

2003

6.8

1985

7.2

1969

6.7

1942

7.4

1998

6.4

1999

6.5

2019

6.5

1975

7.1

1995

6.8

1972

6.9