1970

7.0

1970

6.8

1997

5.6

1977

6.7

1980

5.8

1974

6.4

1985

6.2

1987

6.5

2003

6.2

2015

4.7

1953

6.9

1993

6.5

2015

4.6

1974

0.0

1972

7.9

1998

7.1

1982

7.8

2003

5.2

2000

6.3

2018

0.0