1972

7.7

2019

8.4

2018

4.8

1968

5.1

2017

6.0

2021

8.3

2016

6.9

2017

7.3

2016

5.6

6.8

2012

6.1

2021

6.7

2003

6.4

1960

7.3

2018

8.4

2017

4.0

2019

7.7

2001

7.2

1949

6.0