1990

7.8

2007

7.3

1970

6.3

1984

7.1

2017

6.6

2019

7.7

1987

4.1

2016

5.9

2012

4.8

1987

7.5

2004

6.2

2001

8.9

1928

7.8

2020

6.8

2001

5.3

1967

7.3

1985

6.2

1976

4.7

1989

7.3

2006

6.2