1975

7.9

1976

6.5

1961

7.7

2015

7.6

2014

6.1

2001

5.8

1998

6.2

1986

6.2

2020

6.8

2015

5.2

2004

6.8

2016

6.0

1931

6.9

2012

4.3

1977

7.5

2001

6.1

1987

7.0

2014

5.0

1982

6.0

2007

7.2