1974

7.5

1985

6.6

1975

7.5

2002

7.9

2013

6.9

1997

6.5

1999

7.0

2016

7.0

1973

6.9

1982

7.1

1989

8.1

1984

8.1

1958

6.7

1990

6.2

1960

5.0

1994

6.3

2012

4.0

1995

0.0

1972

8.6

2021

5.7