1968

6.9

2000

5.2

1966

6.1

2016

6.7

1990

5.8

1997

8.0

1989

8.4

1988

5.5

1993

6.1

2020

7.9

2006

9.8

2019

6.6

1979

7.3

2018

6.2

2009

7.1

2004

10.0

1985

6.1

2020

6.7

2001

6.0

1967

7.3