1993

5.8

1996

5.8

2001

6.4

1990

6.1

1987

5.5

1971

7.0

1988

6.1

2000

4.9

1961

7.7

1987

5.3

1966

7.8

2019

6.8

1951

6.4

2007

7.1

1976

7.5

1998

5.0

2016

4.2

1952

7.6

1983

6.5

1990

6.1