1997

6.3

1993

6.2

1994

8.9

1974

10.0

2012

9.7

2011

7.2

2021

6.0

2016

6.3

1979

4.5

2021

6.0

2011

5.9

1987

4.0

1980

5.0

2019

3.2

1963

6.4

2015

6.4