1956

7.6

1969

5.5

1987

6.9

2003

7.2

1966

5.7

1972

7.4

1951

0.0

1964

6.2

1965

6.1

1998

6.8

2007

3.1

1980

6.8

2006

6.7

2003

6.2

2005

6.3

1922

0.0

1996

6.5

1970

7.5

1999

5.7

2019

6.8