1997

6.6

2016

6.8

1972

7.7

1987

5.8

1958

7.3

1984

6.3

1978

6.9

1978

7.6

2002

7.2

2007

9.8

1987

6.1

1980

8.3

2010

5.2

2016

5.9

1971

4.8

2020

7.3

2019

7.4

2021

6.6

2003

7.2

2019

6.4