1967

5.6

1985

6.6

1997

6.4

2015

8.2

1959

8.2

2007

6.6

1997

7.7

2013

5.4

2016

7.6

1994

6.3

1971

7.2

2010

6.8

1986

6.3

1980

8.4

2019

5.7

2005

5.9

1985

5.3

1980

6.7

2016

6.8