1994

7.4

2019

6.7

1980

6.4

2006

10.0

1982

5.2

1992

6.5

2006

5.5

1969

6.8

1989

5.5

2015

6.4

2007

5.9

2003

7.1

1995

6.2

1955

7.2

1990

5.0

1976

7.5

1990

6.5

1952

7.7

2008

7.0

1922

7.2