1989

4.5

1994

8.7

1999

8.4

1985

6.1

2016

7.6

1985

8.3

1974

8.6

1987

7.3

2019

8.1

2009

7.6

1995

8.0

2015

7.9

1985

6.6

1998

6.0

2017

6.1

2016

8.5

1987

6.8

1972

8.7

2016

7.6

1988

6.2